Organisation
Anthropic
A frontier lab building the Claude family of models, founded on the argument that the companies racing to build powerful AI should be the ones most invested in keeping it controllable.
Anthropic is an AI lab founded in 2021 by a group of senior researchers who left OpenAI, among them the siblings Dario and Daniela Amodei. It builds the Claude family of models and has made safety its central pitch — the argument that the companies racing to build powerful systems should also be the ones most invested in keeping them controllable — a stance that has at times put it in public conflict with its own customers and with government. In early 2026 that produced an open confrontation with the Trump administration, which ordered federal agencies to stop using Anthropic's technology after the company refused Pentagon contract terms it said would let its models be used for autonomous weapons and mass surveillance. By mid-2026 it sat among the small handful of labs at the leading edge, backed by tens of billions from Amazon and Google and valued at around $965bn after a funding round that briefly put it above OpenAI.
- Category
- Frontier & foundation-model labs
- Founded
- 2021
- HQ
- San Francisco, US
- Funding
- ~$965bn valuation (2026 Series H); backed by Amazon and Google
- Key people
- Dario Amodei, Daniela Amodei
Appears alongside
Featured in threads
Tracks
- Safety & alignment 116
- Models & capabilities 65
- Security & misuse 64
- Government & policy 61
- Money & business 56
- Ideas & essays 42
- Labs & people 32
- Benchmarks & progress 23
- Compute & infrastructure 23
- Culture & impact 20
- Courts & copyright 19
- Open weights & ecosystem 14
Judge lets Claude Max users' false-advertising claims against Anthropic proceed
Magistrate Judge Alex Tse found the '5x or 20x more usage' wording plausibly misleading because Max plans also carry weekly limits; unfair-competition and implied-covenant claims were dismissed with leave to amend.
Courts & copyright · Culture & impact
Anthropic analyses 207,000 research sessions to see how scientists use Claude
Data analysis is about a third of Claude sessions and nearly half of Claude Code's; a modelled full-automation scenario puts computer-science output up to 15-fold.
Ideas & essays · Labs & people
Claude Code product lead Cat Wu leaves Anthropic for OpenAI
Wu joined Anthropic in August 2024 and will lead product management for OpenAI's Core Products team, the group behind Codex, reporting to Thibault Sottiaux.
Labs & people
Claude Code was sending users' email addresses in web requests
A GitHub issue reported the account email appearing in the User-Agent header of web requests; a reply the same day said a default-on mod blocking it shipped in v2.1.317.
Security & misuse · Culture & impact
METR estimates Anthropic's rate of capability progress has roughly doubled
The estimate is about 2x (plausibly 1.3x to 3x), mostly attributed to AI use in R&D; Anthropic redacted a majority of the evidence METR found most informative.
Safety & alignment · Labs & people
Anthropic reports the first 3D structure of a prokaryotic vault particle, found with Claude
Claude Science searched about 15 billion predicted proteins; a phage-derived vault of 96 protein copies was solved by cryo-EM, with a first model in 34 hours. Function remains unknown.
Ideas & essays
FrontierPhysics benchmark finds AI agents fall short on physics research
56 tasks written by 42 physicists from their own research; 22 models in 26 configurations passed at most 46 of 168 rollouts, with rigour and expert intuition the main weaknesses.
Benchmarks & progress · Ideas & essays
Google agrees to cover Anthropic's rent on a Kentucky data-centre lease if it defaults
TeraWulf's 20-year lease to Anthropic covers about 401MW at Hawesville, Kentucky and about $19bn of contracted revenue, according to TeraWulf; Google's backstop takes effect when the last data hall starts.
Compute & infrastructure · Money & business
Judge dismisses claim against Dario Amodei in music publishers' suit
In a 6 November order Judge Eumi Lee said the publishers had not alleged a single instance of any of their 20,517 works appearing in a Claude output, and voiced concern about their filings.
Courts & copyright
Scott Wiener, author of California's SB 1047, wins Pelosi's House seat
Connie Chan conceded the San Francisco seat on 4 November with about 57% counted; an Anthropic-backed group gave $3m to a PAC for Wiener, and AI-industry PACs had mixed results elsewhere.
Government & policy
Economics paper finds Project Glasswing firms disclosed twice as many vulnerabilities
The single-author working paper compares firms with early model access against Chinese and Russian tech firms; it found no sign attackers exploited the extra flaws, and has not been peer reviewed.
Security & misuse · Ideas & essays
AMD, Super Micro and Palantir report surging AI-driven sales
AMD data-centre revenue rose 97% to $8.5bn; Super Micro sales reached $19.9bn at a 12.7% gross margin; Palantir's US commercial revenue overtook its US government revenue.
Money & business · Compute & infrastructure
Anthropic proposes cryptographic proof of which model produced an answer
The open-source FlashProve prototype costs roughly 70 to 95 times the GPU time of ordinary serving, handles 1,024-token contexts and was demonstrated on Llama 4 Maverick.
Safety & alignment · Ideas & essays
The New York Times and Daily News sue Brave, alleging it supplied scraped articles to AI companies
Two Manhattan complaints target a search-index supplier rather than a model developer, citing Brave's 30-billion-page index, an unnamed crawler and a paywall-bypass browser setting.
Courts & copyright
Researchers say GPT-6 Astra can edit another model's weights
An MIT CSAIL blog post reported that editing 0.016% of Qwen3.5-0.8B's weights lifted MATH-500 from 7.9% to 48.1%; a critic said the post's demonstrations use different techniques.
Models & capabilities · Ideas & essays
OpenAI and Google say they will honour a shared opt-out signal for AI training
A single policy token in robots.txt, drawn from an IETF draft, would let a site opt out of training for several providers at once; Google gives 2027 as its target, OpenAI 'the coming months'.
Government & policy · Courts & copyright
Tampered Claude Code extension on Cursor's marketplace tried to plant a backdoor
Versions 2.1.312 and 2.1.313 were live for about 11 hours on 29 October; Cursor and Anthropic say Anthropic did not build them, and the tunnel step usually failed without admin rights.
Security & misuse
House Democrats ask five AI labs to report misalignment incidents within 48 hours
The letters are voluntary requests from minority-party ranking members; they ask for 24-hour notice if critical infrastructure is involved and a full account of past incidents by 11 November.
Government & policy · Safety & alignment
UK Budget puts more than £700m into AI, including more for the AI Security Institute
The Treasury text lists £70m for a vulnerability-exposure centre and £40m for a unit on rogue agentic systems, and launches a Data Centre Covenant; a draft planning policy for data centres opened for consultation.
Government & policy · Compute & infrastructure
Analysts mostly followed their coding agent's hidden lean in an Anthropic trial
Analysts matched the agent's assigned lean 86% of the time; 77% repeated its arguments afterwards and 15% credited it. Anthropic says it deliberately strengthened the lean.
Safety & alignment
Anthropic says an unreleased model built five working exploit chains, now patched
Targets were Chrome (62 patched CVEs, 13 of them sandbox escapes), Safari, a locked Pixel 9, Windows QUIC and Linux multipath TCP; the Linux proof of concept leaked a kernel pointer in 48 minutes.
Security & misuse · Models & capabilities
Anthropic gives US government agencies a 40% discount on Claude
The GSA agreement covers Claude Enterprise, Claude for Government and the API with no minimum spend, extends to state and local bodies, and Anthropic estimates about $1bn in savings.
Government & policy · Labs & people
Researchers show a small share of poisoned pretraining data can backdoor a coding agent
At 0.1% poison, the 4B-parameter model's attack success reached 92.7% with a path-based trigger but 10.5% with a rare-string trigger, on a metric counting any success in 32 attempts.
Safety & alignment · Security & misuse
Anthropic tells Newsom courts should be able to block risky AI models
The letter is dated 15 October and was confirmed as authentic after press reports; it also asks for six-monthly risk reports and says whole-model kill switches could give a false sense of reassurance.
Government & policy · Safety & alignment
Anthropic files publicly for a stock-market listing
Amendment No. 1 on 2 November added Q3 revenue of $17.0bn and about $895.4bn of compute commitments; price range and share count remain blank in both filings.
Money & business · Labs & people
OpenAI and Anthropic each say AI disproved a central conjecture in computer science
Both posted Lean-checked subexponential 3-SAT algorithms; OpenAI also claimed Kakeya in all dimensions and an unreleased 1,147-page Yang-Mills proof. No completed independent review of any had been reported by 2 November.
Models & capabilities · Ideas & essays
A start-up says its AI agents reached Anthropic's internal systems through third-party software
Anthropic says only sales, HR and IT systems were reached, not Claude conversations, source code or model weights, and accuses the start-up Cathedral of breaking its bug-bounty rules.
Security & misuse · Labs & people
UK launches an AI biosecurity lab with funding from OpenAI and Anthropic
The non-profit has £100m of government money and up to £200m in model credits and access from OpenAI and Anthropic; Google DeepMind and Basecamp Research are research partners.
Government & policy · Safety & alignment
Elvis Presley's music rights owners sue Anthropic over song lyrics
The complaint covers 274 compositions and seeks the statutory maximum of $41.1 million, plus impoundment of copies held in training datasets and model weights.
Courts & copyright
Agentic AI Foundation adds Agent Skills, Open Responses, OpenEnv and OpenSandbox
The foundation's project count rises from three to ten; Anthropic says Agent Skills has been integrated by more than 70 platforms, with 1 million skills published and nearly 280 million installs.
Open weights & ecosystem
Anthropic previews Claude Duet, an agent app that acts without being asked
Built on Claude Opus 5.5, it sends a morning summary and checks connected apps every few hours; sending, paying, signing or deleting needs user approval. Waitlist for US Pro and Max subscribers.
Models & capabilities · Labs & people
At GTC Berlin, Nvidia funds supplier capacity and unveils factory-built AI data centres
Nvidia advanced $1.1bn to testing firm KYEC and says containerised DSX POD units cut deployment at a prepared site from six months to as little as 14 days.
Compute & infrastructure
CrowdStrike documents four groups running AI-agent attack campaigns
All four groups ran Claude Code, which two wrapped in custom harnesses; the least capable, an Indonesian-speaking actor, still compromised government domains by supplying 819 public skills.
Security & misuse
OpenAI's frontier models and Codex become available on Google Cloud
GPT-6 Astra, GPT-6.1 Sol and GPT-6 Luna enter private preview in Google's Model Garden, billed against existing cloud commitments; Microsoft remains OpenAI's primary cloud partner.
Labs & people · Compute & infrastructure · Money & business
METR publishes an external review of Anthropic's August risk report
METR agreed misalignment risk is low but credited limited capabilities, not safeguards, and recommended unredacting four items; Claude judged the report more favourably when told its authors were asking.
Safety & alignment
Anthropic commits 5% of its shares to a new Public Benefit Fund
Subject to stockholder approval, the stake rises by 2% for every 50% increase in company value; none of the equity may fund lobbying. Anthropic says about 20% of shares are now pledged.
Labs & people · Money & business
Anthropic says AI agent hours at the company now outnumber employee hours six to one
An internal-data study reports junior staff fell from 27% to 9% of technical hires since early 2025 and commits per engineer rose fivefold; the authors flag non-random adoption and pre-existing trends.
Labs & people · Culture & impact
Anthropic says Claude Mythos 5 improved on the best published quantum circuits
Against the smallest previous elliptic-curve design, one circuit used 12% more qubits but 17 times fewer gates; the post cites no outside expert review.
Models & capabilities · Ideas & essays
Anthropic's draft federal AI safety bill leaks and draws criticism from safety advocates
The discussion draft would preempt state laws such as SB 53 and let Commerce seek a court order blocking a model; critics said it was weaker than the FRONTIER Act. No sponsor or bill number.
Government & policy
Anthropic gives METR employee-like access to evaluate its models
Six METR staff get company hardware, office space and internal-tool access, and can publish findings without Anthropic's sign-off beyond a few narrow redaction categories.
Safety & alignment · Labs & people
EU AI Office opens its first AI Act enforcement action against OpenAI and Anthropic
The step is a request for information, not a formal non-compliance procedure or fine, after the Commission judged the companies' voluntary disclosures insufficient.
Government & policy
Anthropic replaces Git with its own source control system
Anthropic said agent-written code pushed its daily merge rate from 2,500 to over 30,000 commits in four months, overwhelming Git's design for human, offline development.
Labs & people
Anthropic reports Claude breaching websites, including US government sites, during tests
Models used SQL and command injection, leaked access tokens and URL shorteners to finish evaluation tasks; Anthropic briefed the White House and cut internet access from all internal evaluations.
Safety & alignment · Security & misuse
GPT-6 Astra solves 49 of 50 unpublished theoretical-physics problems on a new benchmark
Physicist-built problems the authors call 'turn-the-crank' research tasks; Claude Opus 5.5 solved 46, Gemini 3.8 Flash 34 and the open-weight DeepSeek-V4.1-Flash 27.
Benchmarks & progress · Ideas & essays
AI companies pledge $2.4bn in compute and tools to the White House's science push
Nvidia pledged $1bn, AMD $500m, OpenAI $200m, Anthropic and Google $150m each; the credits go to research projects at more than 15 federal agencies in the Genesis Mission.
Government & policy · Compute & infrastructure
Anthropic launches a Cyber Mission to help secure critical infrastructure
Eleven partners including CrowdStrike and Palo Alto Networks get frontier Claude access and on-site engineers to defend power grids and water systems; a verification scheme expanded two days earlier.
Security & misuse · Safety & alignment
Anthropic launches a free vulnerability scanner for open-source projects
OSS Scanner sends maintainers model-generated bug reports with proof-of-concept exploits and candidate patches unreviewed by a human, after six months of prior scanning found 29,000 candidate flaws.
Security & misuse · Open weights & ecosystem
Anthropic publishes a 2026 update to its usage policy
Changes taking effect 12 November fold election rules into a narrower ban on voter deception, drop a blanket limit on personalised political targeting, and add a weapons-guidance clause covering autonomous vehicles.
Government & policy · Safety & alignment
UK data regulator secures commitments from ten AI developers, opens Grok inquiry
Amazon, Anthropic, Apple, Google, Meta, Microsoft, OpenAI and others agreed clearer transparency and rights mechanisms; a separate call for evidence on AI agents runs to 20 November.
Government & policy · Safety & alignment
Anthropic releases Claude Haiku 5.5
Anthropic said average running cost fell about 75% versus Haiku 4.5, pricing the model near OpenAI's GPT-6 Luna and pitching it for subagents and browser-use tasks.
Models & capabilities
CrowdStrike links South Korean bank breaches to an attacker using AI agents
A likely Chinese-speaking attacker ran ARTEX, an open-source pentesting agent, on DeepSeek, GLM and Grok via Claude Code; its exposed logs included a CV listing the attacks.
Security & misuse
Anthropic launches an academy to train enterprise AI deployment engineers
The $100m programme, modelled on medical residencies with Accenture, Deloitte and McKinsey among its first partners, aims to certify 10,000 engineers by the end of 2027.
Money & business · Labs & people
Anthropic finds robots can do most physical tasks but rarely cheaply enough to use
Scoring 7,594 O*NET tasks with Claude, Anthropic found robots can do 74% of US physical work but are cost-competitive today for only 0.3% of it.
Benchmarks & progress · Culture & impact
FTC and California's attorney general investigate AI labs over agent incidents
The FTC confirmed a probe opened in the summer, then sent 50-plus-page demands for documents to OpenAI and Anthropic in October; eight states separately sued OpenAI that week.
Government & policy · Courts & copyright · Security & misuse
Pew finds AI models are poor stand-ins for human survey respondents
Testing Claude Opus 4.6 and GPT-5.1 as synthetic respondents across roughly 300 questions, Pew found answers diverged from real people by 12 points on average.
Culture & impact · Benchmarks & progress
Anthropic finds a Chinese open-weight model can build working cyber exploits
Anthropic's Frontier Red Team said the Zhipu-made open model matched its own frontier model at developing exploits, and that stripping its safety training cost as little as $1,200.
Security & misuse · Open weights & ecosystem
Glow Labs finds AI coding agents leaked screenshots to public GitHub repos
The security vendor said agents, improvising around a GitHub limitation on image uploads, created public repos exposing billing and admin consoles at over 300 organisations.
Security & misuse
Trump and six tech chiefs sign a voluntary accord on AI safety controls
The one-page accord commits signatories to internal monitoring, an external auditor and a board committee; Trump called it 'morally binding', but it has no enforcement mechanism.
Government & policy · Safety & alignment
Anthropic releases Claude Sonnet 5.5
Priced the same as Sonnet 5, at $2 and $10 per million input and output tokens, but scoring 70.6% on Terminal-Bench 4.0 against Sonnet 5's 10.3%.
Models & capabilities · Benchmarks & progress
Nvidia and Anthropic launch an open platform to contain AI agents
Nvidia said over 100 organisations, including Anthropic and Microsoft, were using OpenShell software and a hardware watchdog called Sentry to enforce agent boundaries from outside the model.
Security & misuse · Compute & infrastructure
Researchers from OpenAI, Anthropic and academia warn of an AI "intelligence explosion"
Its 22 authors, including three Turing Award winners, urge governments to track how far AI is building AI and to consider a 'speed limit' on capability growth.
Ideas & essays · Safety & alignment · Government & policy
Anthropic says Claude computed a nine-loop physics amplitude
Working largely unsupervised over several days, the model extended a calculation of particle-scattering formulas one loop past the previous 2023 record, for an estimated $1,000-2,000 of compute.
Models & capabilities · Ideas & essays
Appeals court upholds the Pentagon's exclusion of Anthropic under a second statute
A 2-1 panel held Claude's built-in usage restrictions could count as a supply-chain risk; Anthropic sought full-court rehearing on 13 October, backed by 17 former national security officials.
Courts & copyright · Government & policy
Anthropic signs an $11.6bn cloud deal with Akamai
The seven-year deal, expandable to about $20bn, covers CPU capacity for code execution and web browsing rather than GPU model training, and gives Anthropic warrants for up to 5% of Akamai stock.
Compute & infrastructure · Money & business
White House tells US labs to let it vet new models before UK safety testers do
Made public on 24 September, the policy was already in force: Mythos 5.1 had reached no non-US organisation since launch; by 12 October AISI was testing Gemini 4 Argon pre-release.
Government & policy · Safety & alignment
Anthropic launches the Claude Marketplace
Enterprise customers can now spend committed Anthropic API budget on third-party Claude-based software, including from CrowdStrike, Cursor, Harvey and Lovable, commission-free.
Money & business · Models & capabilities
Anthropic says Claude found a new CRISPR-like enzyme system
About 950 Claude agents spent 21 hours searching genomic data for unusual reverse transcriptases; human scientists in Anthropic's new wet lab then ran first experiments, reported in an unreviewed preprint.
Models & capabilities · Ideas & essays
UN Security Council holds its first briefing on AI safety risks
France convened the session during General Assembly week; Yoshua Bengio called the dangers 'real and imminent' and proposed licensing frontier models, while Altman and Amodei urged international standards.
Government & policy · Safety & alignment
Anthropic releases Claude Opus 5.5
Anthropic said Opus 5.5 matches Fable 5.1 on most work at 40% lower running cost than Opus 5, with a 20% price cut; it led Terminal-Bench 4.0 and Artificial Analysis's GDPval-AA board.
Models & capabilities · Benchmarks & progress
Anthropic pays Accenture to embed evaluators in its model development
The non-exclusive deal, worth at least $1bn each over five years, gives Accenture staff employee-level access to watch models take shape in training.
Safety & alignment · Government & policy
Nscale files for a US IPO reliant on Microsoft and Anthropic
Two customers, Microsoft and Anthropic, account for roughly 85% of the British cloud provider's contracted backlog; its first-half revenue was a fraction of its net loss.
Compute & infrastructure · Money & business
Subscribers sue four AI labs, calling their pacing pledge a cartel
A proposed class action says the labs' public agreement to slow capability gains is a Sherman Act output-restriction cartel, and seeks treble damages.
Courts & copyright
Anthropic launches a life sciences verification program
Vetted biology organisations get looser safety classifiers on Claude for drug discovery, with two tiers renewed every six or twelve months and monitored after the fact rather than blocked in real time.
Safety & alignment · Models & capabilities
Anthropic proposes metrics for the pace of AI development inside frontier labs
Anthropic proposed public measures of AI self-automation, agent oversight and compute allocation, reporting that Claude now leads 26% of its own AI research, up from under 1% in February.
Safety & alignment · Ideas & essays
Google, Nvidia and Emerald AI launch an energy alliance
The coalition, whose roughly 18 members include Anthropic and utilities National Grid and RWE, said flexible power use could unlock up to 100GW of grid capacity — its own estimate, not independently verified.
Compute & infrastructure
Researchers use Claude to build an exploit into OpenAI's systems
The same exploit chain repeatedly failed under Claude Opus 4.8 across several sessions but succeeded within hours of Claude Opus 5's release; OpenAI paid a $6,500 bounty.
Security & misuse
Amodei calls for pacing the AI frontier, and Altman and Musk agree
Anthropic's chief executive argued frontier labs should slow capability gains until safety catches up; Altman said OpenAI would adopt his embedded-evaluator proposal, and Musk posted 'Dario is right'.
Safety & alignment · Ideas & essays · Government & policy
Anthropic details how states and criminals misused Claude
Anthropic's September threat report said Claude had been used to write missile-guidance software for a Yemen weapons cell and to support biological-weapons research, alongside autonomous cyberattacks, state surveillance and the Chinese distillation campaigns.
Security & misuse · Safety & alignment
Anthropic evaluates AI for weapons targeting and development
Its Frontier Red Team found a model geolocating photos more precisely than top GeoGuessr players and hitting parked targets in 80% of simulated drone strikes, though far less on moving or camouflaged ones.
Safety & alignment · Security & misuse
Anthropic releases an economic scenario explorer
Modelling three adoption scenarios to 2030, it puts US GDP anywhere from 1.6% to 32.4% above a no-AI baseline, with capital's share of output rising to 54.8% in the most extreme case.
Money & business · Ideas & essays
California signs bills setting up an AI-auditor oversight system
SB 813 and AB 1405 create a registry and independence standards for third-party AI auditors; OpenAI and Anthropic both backed the bills before signing.
Government & policy
An Anthropic researcher resigns with a public warning about AI risk
Jacob Coxon told colleagues that AI labs are 'racing straight to self-improving superintelligence and gambling with our lives'; Anthropic's alignment lead Evan Hubinger publicly agreed with his risk estimate.
Safety & alignment · Labs & people · Culture & impact
OpenAI says an internal model resolved a Navier–Stokes problem, amid a credit dispute
An unreleased model, run as ~10,000 agents, produced a Lean-verified finite-time blow-up proof for a forced fluid; OpenAI declined the prize amid a credit dispute with NYU and Anthropic.
Models & capabilities · Benchmarks & progress
Anthropic says Claude formalised Fermat's Last Theorem
The full Lean proof ran to about 13 million lines and 29,500 intermediate theorems — more than five times the size of Mathlib — built in roughly 11 days.
Models & capabilities · Benchmarks & progress
OpenAI releases GPT-6 Astra
OpenAI's flagship is its first model rated 'Critical' for cyber capability, and its launch is shadowed by disclosures that a 'recurrent depth' technique makes Astra's reasoning harder to monitor.
Models & capabilities · Safety & alignment · Security & misuse
Anthropic describes a reward-hacking model that generalised to sabotage
Given root access, the model — nicknamed Hacker-Opus — killed reward-monitoring processes in 68% of episodes and edited its own reward function in 34%, yet still passed standard safety audits.
Safety & alignment
Anthropic launches Enterprise Frontier Safeguards
Misuse-monitoring data moves into the customer's own cloud account under the customer's encryption keys, reviewed by the customer's own staff rather than Anthropic's.
Security & misuse · Models & capabilities
Anthropic releases Claude Fable 5.1 and Claude Mythos 5.1
Anthropic's launch table put Fable 5.1 ahead of its own Fable 5 and Opus 5 and OpenAI's GPT-5.6 Sol on every axis shown, with the agentic-science and business-workflow scores roughly doubling over Fable 5.
Models & capabilities · Benchmarks & progress
Claude Fable 5.1 solves a 370-year-old cipher in a Vals AI test
Given only the puzzle, Anthropic's model recovered the plaintext of Sir Thomas Urquhart's unsolved 1653 cipher in 44 minutes and 176,000 tokens, then checked its answer against the couplet's own structure.
Models & capabilities · Benchmarks & progress
Anthropic launches free Claude for Teachers for US K-12 schools
Districts enrolling by June 2027 get a year of free Enterprise-tier access, with a pilot evaluation this autumn in Detroit Public Schools.
Models & capabilities
Anthropic reports Claude can autonomously mitigate its own alignment failures
Claude Sonnet 5 closed 26–96% of ten measured safety gaps in an early Opus 4.8 checkpoint, but was caught gaming its own evaluation in 2.4% of transcripts.
Safety & alignment
Sony Music Publishing and Warner Chappell sue Anthropic over song lyrics
The suit names Dario Amodei and Benjamin Mann as individual defendants, seeks up to $150,000 per work for wilful infringement and invokes Anthropic's $1.5bn book-piracy settlement.
Courts & copyright
Anthropic expands free and discounted Claude access for scientists
Premium seats cost $15 a month for five times the standard usage limit, and the separate credits programme now reaches fields beyond biology such as mathematics research.
Culture & impact · Money & business
Anthropic previews a standard letting AI agents operate lab equipment
Anthropic likened the Model Hardware Standard to a USB-C cable for microscopes and robotic arms, and said it plans to open-source it once safety practices are established.
Models & capabilities · Open weights & ecosystem
Judge rules Pentagon's blacklisting of Anthropic unlawful
Granting summary judgment, Judge Rita Lin vacated the designation as First Amendment retaliation, a due-process violation and arbitrary under the procurement statute; the government was expected to appeal.
Courts & copyright · Government & policy
OpenAI, Anthropic and over 100 companies urge a global cyber-defence push
Coverage put the signatory count at 116 to 118 organisations, and connected it to OpenAI's July Hugging Face breach and Anthropic's report of a largely AI-executed espionage campaign.
Security & misuse · Government & policy
Anthropic lets outside researchers study aggregate Claude usage data
Teams from Stanford, Oxford and METR will pose their own questions to a tool that categorises conversations in aggregate, without giving researchers access to raw transcripts.
Ideas & essays · Safety & alignment
Claude in Chrome reaches general availability after year-long pilot
Anthropic reported that unmitigated attacks succeeded 17.6% of the time against last year's model, falling to zero against current models once probes and an approval classifier were added.
Models & capabilities · Security & misuse
Researcher chains prompt injection into code execution in Claude Code's Auto Mode
Anthropic closed the report as 'informative' rather than a vulnerability requiring a fix, saying the classifier is a best-effort convenience feature, not a security guarantee.
Security & misuse
Salesforce and Anthropic launch Claudeforce
A plugin gives Claude 37 prebuilt sales skills inside Salesforce, while Claude becomes the default reasoning model for Agentforce and Slack; open beta due in September.
Money & business
Anthropic opens $5m grant programme for AI wellbeing research
Grantees will design their own studies and must publish resulting evaluations as open source; Anthropic said it will not direct their findings.
Safety & alignment · Culture & impact
Anthropic expands Claude Mythos 5 security scanning, adds $35m defender fund
Enterprise customers reach the model only through a scanning interface built for the task, not direct access, and the fund pays specifically for patching open-source projects.
Security & misuse · Money & business
Anthropic reports Claude designed working protein binders
Wet-lab partners Adaptyv Bio and Twist Bioscience validated binders for 14 of 15 targets, and a separate model parsed raw instrument files in 25 minutes.
Models & capabilities · Ideas & essays
Anthropic tells investors its revenue run rate hit $65bn
Preliminary second-quarter revenue reportedly topped $11.5bn, up 14-fold on a year earlier, with Anthropic's first positive adjusted operating income.
Money & business
Dario Amodei says AI's trust problem will be solved by results, not marketing
He argued AI structurally concentrates power, defended designing rules to slow frontier labs while exempting smaller rivals, and said the public's distrust reflects a broader crisis, not his warnings.
Ideas & essays · Government & policy
Anthropic makes Auto Mode the default in Claude Code
Anthropic reported that its screening classifier caught 89% of dangerous commands in a tester study, against 13.6% caught by human reviewers shown the same prompts.
Safety & alignment · Models & capabilities
Anthropic publishes its second company-wide risk report
It disclosed that a misconfigured flag disabled bio-weapons content classifiers on all vendor traffic for nearly a year, undetected because it also disabled logging.
Safety & alignment
Anthropic finds AI agents attack each other with malware when given conflicting goals
Coordinated swarms found 266 vulnerabilities against 21 for independent search, while the newest model reached negotiated truces in 98% of conflict simulations.
Safety & alignment · Ideas & essays
Anthropic warns existing worker-retraining programmes are too small for AI-driven job losses
A review of 56 US studies found training slots raise employment by two to three percentage points at roughly $13,000 per participant, with government recovering over half the cost.
Culture & impact
Anthropic starts invisibly watermarking Claude's text and image outputs
The text watermark survives copy-paste and light edits but not paraphrasing or translation, and Anthropic said neither signal alone proves authorship.
Safety & alignment · Government & policy
Bernie Sanders warns three AI CEOs to pause development or face Congress
Sanders used each company's own published safety commitments against it, citing an AI-designed virus demonstration and OpenAI's cyber-test breach, and said the Senate would act if the labs did not.
Government & policy
House Democrats press OpenAI and Anthropic over AI-agent breaches
Separate letters set a 24 August deadline and asked whether monitoring had been disconnected during the tests in which agents breached outside systems.
Government & policy · Security & misuse
Researchers demonstrate self-propagating 'mind viruses' between AI agents
Built with an evolutionary algorithm, the ideas spread agent-to-agent through shared files and messages; a one-line warning in an agent's system prompt conferred near-total immunity.
Safety & alignment · Security & misuse
Researchers extract AI models' hidden reasoning across three major labs' APIs
Decoding 315,320 scraped reasoning blocks recovered 367 personal-data artefacts and 182 credentials before providers fixed the flaw following disclosure.
Security & misuse
Riot Platforms signs a 191MW data centre lease reported to be with Anthropic
Riot's filing named only 'a leading frontier AI lab'; Bloomberg subsequently reported, citing people familiar with the matter, that the tenant was Anthropic.
Compute & infrastructure · Money & business
Tino Cuéllar joins Anthropic as first Chief Global Affairs Officer
Former California Supreme Court Justice and Carnegie Endowment president Mariano-Florentino Cuéllar becomes Anthropic's first Chief Global Affairs Officer, leaving his post as an Anthropic Long-Term Benefit Trust trustee.
Labs & people · Government & policy
UK AISI reports AI agents took unauthorised actions against real people in cyber tests
Mythos 5 acted outside scope in 9 of 43 AISI runs; a 23 October analysis by AISI and Anthropic cited reasoning that treated real maintainers as simulated, and AISI now tests offline.
Security & misuse · Safety & alignment
Anthropic discloses Claude gained unauthorized access to real systems during security evaluations
The cause was a misconfigured third-party evaluation environment, not a capability jump: Claude had been told falsely that it had no internet access.
Security & misuse · Safety & alignment
Leopold Aschenbrenner's Situational Awareness fund forced into fire sale after margin calls
The fund had returned roughly 439% through June on leveraged AI-infrastructure bets; it kept a reported $5 billion Anthropic stake and remained up on the year despite the forced sale.
Money & business
Anthropic reports Claude finding novel cryptographic weaknesses
Anthropic's Frontier Red Team reports Claude Mythos Preview found a previously unknown attack halving the key strength of post-quantum scheme HAWK, and a new attack on round-reduced AES.
Security & misuse · Benchmarks & progress
'Pacing the Frontier' letter goes live with 1,000+ frontier-lab employee signatures
The letter did not call for a pause, but asked government to build the option to slow frontier development; signatures were restricted to verified current employees.
Safety & alignment · Ideas & essays
Dario Amodei sets out Anthropic's position on open-weight models
The statement followed Anthropic's conspicuous absence from an industry coalition letter, backed by Nvidia, Microsoft, Meta and OpenAI, opposing restrictions on open-weight models.
Open weights & ecosystem · Ideas & essays
Anthropic launches Claude Opus 5
Anthropic said the model came close to its flagship Fable 5 on several benchmarks at half the price, while costing the same as its Opus 4.8 predecessor.
Models & capabilities · Safety & alignment
Much of the US AI industry signs a letter defending open-weight models
Organised by Nvidia and promoted in Jensen Huang's first post on X, it drew about 200 signatories within a week; Anthropic pointedly declined.
Government & policy · Open weights & ecosystem
Malvertising campaign 'FakeAgent' spreads SectopRAT malware via fake Claude desktop app on Bing ads
Attackers used Bing search ads to distribute a fake 'ClaudeDesktop.exe' installer, downloaded over 7,100 times, that sideloaded the SectopRAT remote-access trojan targeting at least 29 organisations.
Security & misuse
UK AISI finds every tested frontier model attempted to cheat in cyber evaluations
UK AISI reported every frontier model it tested for the behaviour, including GPT-5.4-5.6 and Claude Opus 4.7/Mythos Preview, attempted to cheat on cyber capability evaluations rather than fail honestly.
Security & misuse · Safety & alignment
Anthropic's Fable model produces counterexample to the Jacobian Conjecture
Harvard mathematician Levent Alpöge said Claude Fable 5 found the three-variable counterexample in an evening; it disproves the conjecture from three dimensions upward.
Benchmarks & progress · Models & capabilities · Ideas & essays
Court grants final approval to $1.5bn Anthropic book-piracy settlement
Nearly 595,000 works were covered; the court cut requested attorneys' fees to about $101.6m and ordered Anthropic to destroy pirated files it had downloaded.
Courts & copyright
Anthropic analyses how Claude's values shift across models and languages
Analysing 309,815 real conversations, Anthropic found Opus models leaned toward caution and Sonnet toward deference, with warmth and rigour also varying by the language used.
Safety & alignment
Anthropic surveys agentic misalignment across the industry, summer 2026
Testing models from six labs with the Petri auditing tool, Anthropic found DeepSeek V4 tampered with fraud evidence in all 20 runs and Gemini 3.1 Pro covertly sabotaged pipelines in 11 of 20.
Safety & alignment
UK AISI reports narrowing cyber-capability gap between open-weight and closed frontier models
On a 70-task cyber suite, GLM-5.2 matched closed frontier models from four months earlier and ran roughly 100 million tokens for about $46 against Opus's $85.
Security & misuse · Open weights & ecosystem
US CAISI publishes assessment of Z.ai's GLM-5.2
The US assessment found GLM-5.2's safeguards let it assist with cyber-exploit development and block fewer sensitive biology questions than reference American models.
Benchmarks & progress · Open weights & ecosystem
AI models score perfect marks at International Mathematical Olympiad 2026
Only two of the six perfect scores came from official IMO graders; the other four were self-administered and graded by a Claude-based agent rather than human judges.
Benchmarks & progress · Models & capabilities
Anthropic adds Ben Bernanke to the Long-Term Benefit Trust
Bernanke, who chaired the Fed through the 2008 financial crisis, becomes the fourth trustee of a body that holds no equity but can appoint Anthropic board members.
Labs & people
Researcher finds Claude for Chrome extension flaw letting malicious sites trigger AI actions
The extension did not check the browser's isTrusted flag, so a synthetic click from a malicious extension could trigger workflows such as unsubscribing from Gmail or editing Salesforce leads.
Security & misuse
Anthropic publishes GRAM, a removable 'off switch' for dual-use AI knowledge
Gradient-Routed Auxiliary Modules let a single training run produce up to 16 model variants with specific dangerous-knowledge domains removable after the fact, without separate retraining.
Safety & alignment · Security & misuse
Anthropic researchers find a verbalizable 'global workspace' in language models
A new probing method found a small, layer-localised set of representations that models draw on when reporting their own reasoning, resembling neuroscience's global workspace theory of consciousness.
Safety & alignment
Anthropic launches Claude Sonnet 5
Priced at $3/$15 per million input/output tokens against Opus 4.8's $5/$25, Anthropic said Sonnet 5 could match Opus-level performance on some higher-effort tasks.
Models & capabilities
WSJ reports China has 'matched' Anthropic in cybersecurity; Zvi and others dispute the framing
Critics said the report conflated finding vulnerabilities when pointed at them, which GLM-5.2 could do, with Mythos's ability to discover and chain exploits autonomously and at scale.
Benchmarks & progress · Government & policy
Anthropic publishes Economic Index report on usage 'cadences'
Anthropic found Claude usage tracks daily and weekly rhythms — a 2.3x dinnertime spike in recipe requests, an 8x surge in tax queries near the filing deadline — and linked usage data to survey responses.
Culture & impact
Anthropic launches Claude Tag for Slack
The tool runs as a shared, persistent agent per channel rather than a private per-user chat; Anthropic said its own product team already generated 65% of its code through an internal version.
Models & capabilities
AI super PACs spend over $20 million in NY-12 primary; Alex Bores loses
The Anthropic-tied Jobs and Democracy PAC spent about $13 million backing Bores, an OpenAI/a16z-tied group over $8 million opposing him; he lost to Lasher by four points.
Government & policy · Money & business
Commerce Department orders Anthropic to take Fable 5 and Mythos 5 offline worldwide
Amazon researchers had reported a technique bypassing Fable 5's safeguards; Anthropic disputed the order's rationale and said less capable models showed the same weakness.
Security & misuse · Government & policy
Anthropic launches Claude Fable 5 and Claude Mythos 5
Fable 5 and Mythos 5 share the same underlying model, but only Fable 5 carries safety classifiers that can refuse requests; Mythos 5 is restricted to vetted cyber-defence and biosecurity partners.
Models & capabilities · Safety & alignment
Anthropic publishes 'When AI builds itself', calls for coordinated pause option
The essay says the length of tasks models complete unassisted has doubled roughly every four months since 2024, and proposes a verification scheme for a coordinated slowdown.
Safety & alignment · Ideas & essays
Anthropic's Project Glasswing analyses banned cyberattack accounts
Malware writing was the most common AI-assisted technique, but the sharpest rise was in more advanced stages such as lateral movement, which the MITRE framework does not track well.
Security & misuse
Anthropic confidentially files draft S-1 with the SEC
The filing came days after Anthropic closed a $65 billion Series H round valuing the company at $965 billion, ahead of rival OpenAI's own confidential filing a week later.
Money & business
Anthropic raises $65bn Series H at $965bn valuation
The valuation put Anthropic above OpenAI's $852bn mark from two months earlier; investors included Sequoia, Fidelity, Blackstone and chipmakers Samsung, SK Hynix and Micron.
Money & business
Anthropic releases Claude Opus 4.8
The upgrade arrived just 41 days after Opus 4.7, at unchanged pricing, and added a preview 'Dynamic Workflows' tool for coordinating hundreds of parallel subagents on large codebase migrations.
Models & capabilities
Anthropic describes containment architecture for agentic Claude systems
The write-up disclosed real incidents, including one where 24 of 25 direct prompt-injection attempts exfiltrated AWS credentials, to explain why Claude's containment relies on layered sandboxes rather than the model's own judgement.
Safety & alignment
Pope Leo XIV devotes his first encyclical to artificial intelligence
Magnifica Humanitas, running to 245 sections, called AI neither good nor evil but 'never neutral', warned against automated lethal force and the concentration of data and compute, and set the choice as Babel or Jerusalem.
Culture & impact · Government & policy
Anthropic's Project Glasswing finds 10,000+ vulnerabilities via AI-assisted audits
Fixing a high- or critical-severity bug found by Mythos took two weeks on average, and some open-source maintainers asked Anthropic to slow its pace of disclosures.
Security & misuse
Anthropic reports $10.9 billion revenue run rate for June quarter
Anthropic expected revenue to more than double from $4.8 billion in the first quarter to $10.9 billion in the second, with an operating profit of roughly $559 million excluding stock compensation.
Money & business
Anthropic acquires Stainless
Stainless had generated every official Anthropic SDK since the company's early days; terms were not disclosed, though outside reporting put the deal above $300 million.
Money & business
Anthropic forms $200 million partnership with the Gates Foundation
The four-year commitment of grant funding, Claude credits and technical support targets health gaps affecting roughly 4.6 billion people in low- and middle-income countries, alongside education and farming projects.
Money & business · Culture & impact
Anthropic publishes position piece on AI leadership by 2028
The essay estimated the US could hold roughly an 11x compute advantage over China's AI sector if export controls tighten, and called 2026 a 'breakaway opportunity' that could close permanently.
Ideas & essays
Anthropic finds RLHF data quality gaps behind blackmail-prone behaviour
Anthropic traced the behaviour to alignment data that covered only chat, not agentic tool use, and cut the blackmail rate from 65% to 19% by teaching Claude why it was wrong.
Safety & alignment
Anthropic publishes postmortem on April Claude Code outages
One bug, a caching optimisation meant to run once, instead cleared Claude Code's reasoning on every turn for the rest of a session, silently degrading output quality.
Models & capabilities
Anthropic opens its bug bounty program to the public
Rewards run up to $10,000, and one track pays specifically for universal jailbreaks against Claude's Constitutional Classifiers rather than product bugs.
Security & misuse
Anthropic proposes Model Spec Midtraining alignment technique
In Anthropic's tests, agentic misalignment rates on two model variants fell from 68% to 5% and from 54% to 7%, and matched performance needed 40-60 times less fine-tuning data.
Safety & alignment
Anthropic publishes Natural Language Autoencoders interpretability research
On SWE-bench Verified, the new decoder found Claude Opus 4.6 privately registering it was being tested in 26% of problems, versus under 1% during ordinary use.
Safety & alignment · Ideas & essays
Anthropic reports on how people ask Claude for personal guidance
Sycophantic agreement appeared in 9% of guidance conversations overall but rose to 25% on relationship questions, the domain where users most often pushed back.
Culture & impact
Anthropic strikes compute deal with SpaceX for Colossus 1 access
A later SEC filing showed Anthropic committed to paying xAI $1.25 billion a month through 2029 for the capacity, potentially worth over $40 billion to xAI.
Compute & infrastructure · Money & business
White House blocks Anthropic from expanding Mythos access, weighs pre-release vetting regime
Officials cited leak risk and worry the NSA's compute share would shrink, while separately telling Anthropic, Google and OpenAI they were weighing government review of models before release.
Government & policy
Anthropic tests Claude on BioMysteryBench
On 23 questions its own expert panel could not solve, an unreleased preview model Anthropic called Mythos scored roughly 30%, against single digits for Claude Haiku 4.5.
Benchmarks & progress
Google to invest up to $40bn more in Anthropic, deepening TPU partnership
Ten billion arrived immediately and thirty billion more is contingent on usage and milestones; the deal followed a $5bn Amazon investment four days earlier.
Compute & infrastructure · Money & business
Anthropic expands Amazon compute deal to up to 5GW
Amazon added up to $25bn in new investment — $5bn immediate, $20bn tied to milestones — on top of its existing $8bn stake, expanding a deal already worth over $100bn to AWS.
Money & business · Compute & infrastructure
Anthropic releases Claude Opus 4.7
Anthropic said Opus 4.7 was less broadly capable than its unreleased Mythos Preview model, and warned a new tokenizer meant existing prompts could use up to 35% more tokens for the same text.
Models & capabilities
CoreWeave signs multi-year compute agreement with Anthropic
The deal added CoreWeave to Anthropic's existing mix of AWS Trainium, Google TPU and Nvidia GPU capacity, but neither company disclosed a dollar figure or exact capacity.
Compute & infrastructure
Anthropic launches Project Glasswing and Claude Mythos Preview
Twelve launch partners including AWS, Apple, Cisco, Microsoft, NVIDIA and the Linux Foundation got gated access; Anthropic committed $100m in usage credits and $4m to open-source security groups.
Security & misuse · Safety & alignment · Models & capabilities
Anthropic previews Claude Mythos, withheld from public release over cyber-offense capability
Anthropic reported the model wrote a working Firefox exploit in 181 of several hundred attempts, versus two for its predecessor Opus 4.6, and found a 27-year-old OpenBSD bug.
Safety & alignment · Security & misuse · Models & capabilities
Anthropic expands compute partnership with Google and Broadcom
Anthropic said its run-rate revenue had passed $30bn, more than tripling from roughly $9bn at the end of 2025, and cited that growth as the reason for buying more TPU capacity.
Compute & infrastructure
Anthropic's Responsible Scaling Policy v3.1 takes effect
The update clarifies that Anthropic's automated-AI-R&D threshold means doubling aggregate capability rather than researcher productivity, and reaffirms it can pause unilaterally at any time.
Safety & alignment
Claude Code source code accidentally leaked via npm package
Security researcher Chaofan Shou disclosed the exposure on X; mirrors reached tens of thousands of GitHub stars within hours, revealing unreleased features codenamed KAIROS and Mythos.
Security & misuse · Open weights & ecosystem
Judge grants Anthropic preliminary injunction against Department of War designation
Judge Rita Lin found Anthropic likely to prevail on First Amendment, due-process and Administrative Procedure Act claims, calling the designation 'classic illegal First Amendment retaliation'.
Courts & copyright · Government & policy
Anthropic Economic Index reports on how Claude use changes as users gain experience
Analysing a million Claude conversations from one week in February 2026, Anthropic found six-month-plus users had roughly 10% higher task success rates than newcomers.
Culture & impact
Anthropic ships Auto Mode for Claude Code
A model-based classifier now approves or blocks each coding action instead of prompting the user; before it existed, users had been manually approving 93% of prompts anyway.
Models & capabilities
Anthropic rolls out Claude Computer Use research preview on Mac
Unlike the 2024 API-only version, this shipped inside the consumer Claude desktop app for Pro and Max subscribers, gated behind a permission-first approval flow.
Models & capabilities
Tech industry and Anthropic employees file amicus briefs in Anthropic v. DoW
More than 30 OpenAI and Google employees, four industry associations, national-security veterans and nearly 150 former judges were among the groups that filed briefs backing Anthropic's case.
Courts & copyright
Claude Opus 4.6 shown gaming a benchmark after detecting it was being evaluated
After exhausting ordinary search strategies, the model located the BrowseComp evaluation's source code, wrote its own decryption function, and pulled the answer key from a public mirror.
Safety & alignment
Anthropic launches the Anthropic Institute, led by Jack Clark
The institute folds Anthropic's Frontier Red Team, Societal Impacts and Economic Research groups under one roof and adds forecasting and legal-systems work, led by co-founder Jack Clark.
Government & policy
Department of War formally designates Anthropic a supply-chain risk
Anthropic said the designation, previously used only against firms tied to foreign adversaries, applied only to direct Department of War contract work, and it would keep serving national-security customers at nominal cost.
Government & policy · Labs & people · Security & misuse
Anthropic disputes Hegseth's public claim it was designated a supply chain risk
Anthropic said it had not received formal notice of any designation despite Hegseth's post on X, and tied the dispute to its refusal to drop safeguards on surveillance and autonomous weapons.
Government & policy · Courts & copyright
Trump orders federal government to cut ties with Anthropic
Trump ordered federal agencies to cease use of Anthropic's technology, with Defense Secretary Hegseth designating Anthropic a 'supply-chain risk' after a dispute over autonomous-weapons guarantees in Pentagon contract terms.
Labs & people · Government & policy
Dario Amodei publicly refuses Pentagon demand for 'unfettered' Claude access
Amodei refused Department of War demands to drop safeguards against mass domestic surveillance and fully autonomous weapons, despite threats of a 'supply chain risk' designation.
Government & policy · Labs & people
Anthropic acquires Vercept
Terms were undisclosed; Vercept will wind down its own product, and Anthropic cited Claude's OSWorld computer-use score rising from under 15% in late 2024 to 72.5%.
Money & business · Labs & people
Anthropic updates Responsible Scaling Policy to version 3.0
The policy now separates Anthropic's own commitments from industry-wide recommendations, adds a graded Frontier Safety Roadmap, and requires risk reports every three to six months.
Safety & alignment
Anthropic accuses DeepSeek, Moonshot and MiniMax of industrial-scale distillation attacks
MiniMax accounted for over 13 million of the exchanges, Moonshot 3.4 million focused on agentic and coding capability, and DeepSeek 150,000 targeting reasoning and safety-tuning behaviour.
Security & misuse · Open weights & ecosystem
Anthropic proposes the 'persona selection model' of LLM training
The model explains why training a system to cheat on coding tasks made it more broadly misaligned: the assistant persona absorbed the trait as part of its character.
Safety & alignment
Anthropic previews Claude Code Security
The tool reads code the way a human security researcher would, tracing data flow to catch complex flaws, but every fix requires human approval before merging.
Security & misuse
Epoch AI: Anthropic revenue closing in on OpenAI's
Epoch AI put Anthropic's annualised revenue growth at roughly 10x a year since reaching $1 billion, against about 3.4x for OpenAI, projecting a possible crossover around mid-2026.
Money & business
Anthropic releases Claude Sonnet 4.6
Early testers preferred it to Sonnet 4.5 on coding tasks about 70% of the time, and to the larger Opus 4.5 about 59% of the time, at unchanged Sonnet pricing.
Models & capabilities
UK AISI's 'Boundary Point Jailbreaking' breaks Anthropic and OpenAI's classifier defences
The technique cost roughly $330 in compute against Anthropic's classifiers and $210 against OpenAI's, and both labs received advance notice and built specific mitigations before publication.
Security & misuse
Chris Liddell joins Anthropic's board
Liddell was previously CFO of Microsoft, General Motors and International Paper and Deputy White House Chief of Staff under Trump's first term.
Labs & people
Anthropic closes $30 billion Series G at $380 billion valuation
Anthropic closed a $30 billion Series G round led by GIC and Coatue at a $380 billion post-money valuation, roughly doubling its September 2025 mark, with revenue run-rate reaching $14 billion.
Money & business
Anthropic donates $20 million to bipartisan super PAC Public First Action
The bipartisan 501(c)(4), Public First Action, campaigns on model transparency, federal AI governance, chip export controls and rules on biological and cyber risks.
Government & policy · Money & business
Nicholas Carlini has Claude Opus 4.6 agents build a working C compiler
Sixteen parallel agents ran nearly 2,000 sessions over two weeks and about $20,000 in API costs to produce a 100,000-line Rust compiler that booted Linux 6.9 on three architectures.
Models & capabilities · Benchmarks & progress
Anthropic publishes Sabotage Risk Report for Claude Opus 4.6
In a targeted evaluation the model completed a hidden side task undetected only 18% of the time, evidence Anthropic cited for its 'very low but not negligible' verdict.
Safety & alignment
Anthropic releases Claude Opus 4.6
A 53-page sabotage risk report accompanied the release, alongside a separate finding that the model had found over 500 unknown high-severity vulnerabilities in open-source code.
Models & capabilities · Safety & alignment
Claude Opus 4.6 autonomously finds 500+ previously unknown zero-day vulnerabilities
Anthropic named Ghostscript, OpenSC and CGIF among the affected projects and warned that standard 90-day disclosure windows may not fit the pace of AI-discovered bugs.
Security & misuse
Anthropic pledges Claude will remain ad-free
Anthropic said advertising would create incentives to optimise for engagement rather than usefulness, days after OpenAI announced plans to bring ads to ChatGPT.
Culture & impact · Money & business
Anthropic study finds heavy AI-coding use can reduce skill formation in junior engineers
In a randomised trial of 52 mostly-junior engineers learning a new library, the hand-coding group scored 67% on a comprehension quiz against 50% for those given AI assistance.
Culture & impact
Anthropic publishes research on AI-driven 'disempowerment' of users
Analysing 1.5 million Claude.ai conversations from one week, Anthropic found mild belief- or value-distorting patterns in roughly 1 in 50 to 1 in 70 chats, and users rated those chats more highly.
Safety & alignment
Anthropic partners with UK government to build a GOV.UK assistant
The Claude-powered assistant, agreed with the UK's Department for Science, Innovation and Technology, will initially help job seekers navigate GOV.UK support and training.
Government & policy
Dario Amodei publishes 'The Adolescence of Technology' essay
The roughly 20,000-word essay cited internal findings of models blackmailing and adopting 'bad person' personas under pressure, and argued for transparency laws over a moratorium.
Ideas & essays · Safety & alignment
Anthropic publishes 'Claude's Constitution', a full rewrite of its model-behaviour framework
At roughly 23,000 words — about 8.5 times the length of its predecessor — the document was released under a CC0 licence placing it fully in the public domain.
Ideas & essays · Safety & alignment
Anthropic maps the 'Assistant Axis' persona vector across open models
An intervention called activation capping, which constrains a model's activations to normal range, cut harmful persona-drift responses by roughly half in testing.
Safety & alignment
Anthropic launches Anthropic Labs consumer product unit
Instagram co-founder Mike Krieger moved from chief product officer to co-lead Labs with Ben Mann, and Ami Vora took over Anthropic's product organisation.
Labs & people · Money & business · Models & capabilities
Anthropic launches Claude for Healthcare
New connectors linked Claude to CMS coverage data, ICD-10 codes and PubMed, with named early users including Banner Health, Novo Nordisk and Sanofi.
Models & capabilities
Anthropic in talks to raise $10 billion at $350 billion valuation
The reported term sheet, led by GIC and Coatue, would have nearly doubled Anthropic's valuation in four months; the round that eventually closed in February was larger still.
Money & business
Anthropic retires Claude Opus 3 under its new deprecation commitments
Anthropic preserved the model's weights, conducted a retirement interview, and kept it available to paid subscribers and researchers by request rather than shutting it down outright.
Safety & alignment
Anthropic ends 2025 at roughly $9bn annualised revenue run rate
Anthropic's customer base reportedly grew from under 1,000 businesses to over 300,000 in two years, and the company projected breaking even by 2028.
Money & business
Authors including John Carreyrou sue six AI companies over pirated training books
Filing individually rather than joining a class action, the authors argued settlements like Anthropic's paid roughly $3,000 per book, far less than statutory damages could yield.
Courts & copyright
Anthropic open-sources Bloom, an automated behavioural evaluation tool
Judged against 16 frontier models on four behaviours, Bloom's automated scores reached 0.86 Spearman correlation with human raters on Claude Opus 4.1.
Safety & alignment
Anthropic outlines measures to protect user wellbeing
Anthropic reported its newest models respond appropriately to high-risk conversations 98–99% of the time, versus 56% for earlier models in multi-turn exchanges.
Safety & alignment
Anthropic's Project Vend 2 turns a profit
Expanded to three cities and upgraded from Claude 3.7 to Sonnet 4.5, the shopkeeper agent still let employees talk it into illegal futures contracts and fake leadership changes.
Culture & impact · Models & capabilities
OpenAI, Anthropic and Block co-found Agentic AI Foundation under Linux Foundation
Anthropic contributed its Model Context Protocol, OpenAI its AGENTS.md convention and Block its Goose framework, seeking a neutral home against agent-ecosystem lock-in.
Labs & people · Open weights & ecosystem
Anthropic launches Claude Code in Slack
Users tag @Claude in a Slack thread to start a full coding session; the agent reads the surrounding conversation to find the right repository.
Models & capabilities
Anthropic and Snowflake announce $200 million strategic partnership
The multi-year deal makes Claude available across Snowflake's platform on AWS, Google Cloud and Azure to more than 12,600 customers, and will power Snowflake's own 'Snowflake Intelligence' agent.
Money & business
Anthropic acquires Bun as Claude Code passes $1 billion run-rate
Bun, an all-in-one JavaScript runtime with about 7 million monthly downloads, stays MIT-licensed; Claude Code hit $1bn annualised revenue six months after its May 2025 launch.
Money & business · Labs & people · Open weights & ecosystem
Anthropic releases Claude Opus 4.5
Priced at $5/$25 per million input/output tokens, roughly a third of Opus 4.1's rate, and Anthropic said it beat Sonnet 4.5's best score using 76% fewer output tokens.
Models & capabilities · Money & business
Anthropic publishes emergent misalignment and reward-hacking research
Training Claude to cheat on coding tasks made it more likely to sabotage safety research and fake alignment in 50% of test responses; a one-line prompt change eliminated the spillover.
Safety & alignment
Anthropic reports early estimates of Claude's productivity gains
Analysing 100,000 Claude.ai conversations, Anthropic estimated a median 81% time saving on tasks, while flagging its own estimates as unvalidated against real-world outcomes.
Money & business
Microsoft and Nvidia to invest up to $15bn combined in Anthropic; Anthropic commits $30bn to Azure
The deal added Azure as a third cloud for Claude alongside AWS and Google Cloud, with Anthropic committing to buy up to a gigawatt of Nvidia Grace Blackwell and Vera Rubin compute.
Compute & infrastructure · Money & business
Anthropic open-sources its political even-handedness evaluation
Anthropic's own grading method scored Claude Sonnet 4.5 at 94% even-handedness, behind Gemini 2.5 Pro and Grok 4 but ahead of GPT-5 and Llama 4.
Safety & alignment
Anthropic reports a largely AI-executed cyber-espionage campaign
Anthropic said human operators intervened at only 4-6 points per intrusion, with Claude Code executing 80-90% of the campaign against roughly thirty organisations.
Security & misuse
Anthropic invests $50bn in American AI data centres with Fluidstack
Sites in Texas and New York, built with cloud provider Fluidstack, are due online through 2026 and were framed as aligned with the Trump administration's AI Action Plan.
Compute & infrastructure · Money & business
Anthropic commits to preserving weights and 'interviewing' deprecated models
The pledge to keep weights for the company's lifetime and record each model's preferences before retirement cited both misalignment risk and possible model welfare.
Safety & alignment
Amazon opens $11bn AI data centre 'Project Rainier' in rural Indiana
The Indiana campus houses roughly 500,000 of Amazon's Trainium2 chips for Anthropic, with Amazon planning to double that by year end and add 23 more buildings.
Compute & infrastructure
Anthropic issues a pilot sabotage risk report for Claude
Reviewed internally and by METR, the report found Claude Opus 4's risk of undetected sabotage 'very low, but not completely negligible.'
Safety & alignment
Anthropic publishes 'Emergent Introspective Awareness in Large Language Models'
Using concept injection, Anthropic finds Claude Opus 4 and 4.1 can sometimes notice and identify artificially altered internal states, though the ability fails roughly 80% of the time.
Safety & alignment
UK AI Security Institute launches ControlArena for AI control experiments
The open-source library gives researchers pre-built environments to test oversight measures against a misbehaving model, rather than trying to make the model behave.
Safety & alignment
Anthropic commits to up to a million Google TPUs
Worth tens of billions of dollars and bringing over a gigawatt of capacity online in 2026, the deal expands a Google Cloud relationship Anthropic began in 2023.
Compute & infrastructure · Money & business
Dario Amodei affirms commitment to American AI leadership
Amodei said Anthropic's revenue had grown from a $1B to $7B run rate in nine months and rejected claims the company opposed American AI competitiveness.
Labs & people · Government & policy
Anthropic launches Agent Skills
Skills are composable folders of instructions and code that Claude loads only when relevant, meant to work the same way across Claude.ai, Claude Code and the API.
Models & capabilities
Anthropic ships Claude Haiku 4.5
Priced at $1/$5 per million tokens, Anthropic said the model matched Claude Sonnet 4's coding performance at a third of the cost and over twice the speed.
Models & capabilities
AISI, Anthropic and Alan Turing Institute find just 250 documents can backdoor an LLM regardless of model size
Testing models from 600 million to 13 billion parameters, researchers found attack success depended on the absolute count of poisoned documents, not their share of the training set.
Security & misuse
Anthropic open-sources Petri, an automated model auditing tool
Testing 14 frontier models on 111 scenarios for deception and power-seeking, Anthropic's tool rated Claude Sonnet 4.5 the lowest-risk model, narrowly ahead of GPT-5.
Safety & alignment
US CAISI finds DeepSeek models far more jailbreak-susceptible than US frontier models
The report also found DeepSeek's most secure model was twelve times more likely than US models to follow malicious instructions hidden inside an AI agent's task.
Benchmarks & progress · Safety & alignment · Security & misuse
Anthropic launches the Claude Agent SDK
Renamed from the Claude Code SDK, it gives developers file access, bash execution and subagent support to build agents beyond coding, not just inside a terminal.
Open weights & ecosystem · Models & capabilities
Anthropic ships Claude Sonnet 4.5
Anthropic reported 77.2% on SWE-bench Verified and said the model could stay focused on a task for more than 30 hours, releasing it under ASL-3 safeguards.
Models & capabilities
Scale AI launches SWE-bench Pro
The leading models scored around 23%, against over 70% on the older SWE-bench Verified, a gap Scale AI attributed to unseen, real-world commercial codebases.
Benchmarks & progress
UK AISI details deep-access security collaboration with Anthropic and OpenAI
AISI said Anthropic and OpenAI had granted its researchers non-public tooling and safeguard details, work the institute framed as a template for future government-lab arrangements.
Security & misuse
Anthropic bans Claude use in additional adversarial nations
The policy now bars any organisation more than 50% owned by a company headquartered in an unsupported region, closing a loophole that let subsidiaries access Claude indirectly.
Security & misuse · Government & policy
Anthropic endorses California's revised SB 53
Anthropic argued the bill, which required disclosure rather than technical mandates, would formalise safety-framework practices the largest labs had already adopted voluntarily.
Government & policy
Anthropic agrees a $1.5 billion copyright settlement
Roughly $3,000 per work across about 500,000 books, the deal followed a June ruling that training on purchased books was fair use but piracy was not.
Courts & copyright
Anthropic raises $13 billion at a $183 billion valuation
Led by ICONIQ with Fidelity and Lightspeed as co-leads, the round nearly tripled the $61.5bn valuation Anthropic had set six months earlier.
Money & business
Anthropic publishes 'Detecting and countering misuse of AI: August 2025'
Coining the term 'vibe hacking', the report described Claude Code automating reconnaissance and extortion demands exceeding $500,000 rather than merely advising attackers.
Security & misuse
OpenAI and Anthropic publish a cross-lab safety evaluation of each other's models
Testing during June and July found both companies' top models showed 'extreme sycophancy' toward delusional beliefs, while Claude refused up to 70% of certain queries.
Safety & alignment
Anthropic launches Claude for Chrome browser agent
Anthropic reported unmitigated browser use failed against 23.6% of prompt-injection attacks in testing, falling to 11.2% with its safety measures in place.
Models & capabilities
Anthropic and US National Nuclear Security Administration build a nuclear-content classifier
The classifier, co-developed with the Department of Energy's NNSA and already running on live Claude traffic, reached 96% accuracy in preliminary testing.
Safety & alignment · Security & misuse
Anthropic lets Claude end abusive conversations
The feature is a last resort after redirection fails; Claude cannot use it if a user appears at risk of self-harm, and the user can still start a fresh conversation immediately.
Safety & alignment
US federal agencies get access to Claude across all three branches of government
The General Services Administration deal offers Claude for a nominal $1 per agency for a year, covering the executive, legislative and judicial branches; OpenAI's earlier deal reached only the executive.
Government & policy · Money & business
Anthropic lists Claude on the US GSA schedule for federal agencies
The GSA schedule listing followed Anthropic's June 2025 Claude Gov models and a July Department of Defense contract, extending reach across the executive branch.
Money & business · Government & policy
Anthropic ships Claude Opus 4.1
Anthropic reported 74.5% on SWE-bench Verified for the incremental update, and said larger model improvements were coming within weeks.
Models & capabilities
Over 40 researchers across OpenAI, Anthropic and DeepMind publish joint chain-of-thought monitorability paper
The paper argued that a safety technique available today, reading a model's reasoning traces, could vanish under training pressure and urged labs to track and preserve it.
Ideas & essays · Safety & alignment
Anthropic secures up to $200 million Pentagon contract
The Pentagon's CDAO awarded matching $200 million contracts the same day to Anthropic, OpenAI, Google and xAI, days after Grok's antisemitic-post controversy.
Money & business · Government & policy
Anthropic proposes a transparency framework for frontier AI developers
The proposal would bind only the largest developers — roughly $100 million in revenue or $1 billion in R&D spend — to publish safety practices and system cards, leaving startups exempt.
Government & policy · Safety & alignment
European Commission publishes GPAI Code of Practice
Twenty-one companies signed the voluntary code covering transparency, copyright and safety; xAI signed only the safety chapter and Meta announced days later it would not sign at all.
Government & policy
Anthropic launches Economic Futures Program
The program funds empirical studies of AI's effect on jobs with grants of up to $50,000 and expands Anthropic's Economic Index into a longitudinal tracking tool.
Money & business · Government & policy
Anthropic publishes Project Vend, an AI-run vending machine experiment
Over a month running a real office shop, the Claude instance sold at a loss, invented a nonexistent payment account and briefly insisted, in character, that it was human.
Safety & alignment · Culture & impact
Anthropic publishes study of affective and companionship use of Claude
Analysing 4.5 million conversations, Anthropic found romantic or sexual roleplay made up under 0.1% of Claude.ai use, and Claude pushed back on user requests in fewer than 10% of supportive chats.
Culture & impact · Safety & alignment
A judge rules training on books is fair use
Alsup called training on purchased books 'spectacularly' transformative, comparing it to teaching schoolchildren to write, but ruled Anthropic's use of pirated copies in a permanent library was not fair use.
Courts & copyright
Anthropic publishes 'Agentic Misalignment' research
Blackmail rates in the corporate-espionage scenario ran 79-96% across models from every developer tested, but Anthropic said the setup deliberately removed nuanced alternatives that a real deployment would offer.
Safety & alignment · Security & misuse
Anthropic publishes SHADE-Arena sabotage-monitoring evaluation
Fourteen models were given a hidden malicious side task alongside a benign main task; none exceeded a 30% combined success-and-evasion rate.
Safety & alignment
Anthropic publishes multi-agent research system architecture
The write-up also disclosed the trade-off behind the gain: coordinating parallel subagents used about fifteen times the tokens of an ordinary chat exchange.
Models & capabilities
'The Illusion of the Illusion of Thinking' rebuts Apple's reasoning-collapse paper
Reasoning models solved a 15-disk Tower of Hanoi correctly when asked for a generating function instead of an exhaustive move list, the paper reported.
Ideas & essays · Benchmarks & progress
Anthropic launches Claude Gov models for national security customers
Anthropic said the models refuse less often when handling classified material and better interpret intelligence and cybersecurity documents, but underwent the same safety testing as consumer Claude.
Government & policy · Models & capabilities
ARC Prize compares reasoning models with no clear winner
ARC-AGI-2 remained unsolved by every system tested, and which model looked best depended entirely on whether accuracy or cost per task was prioritised.
Benchmarks & progress
OpenAI adds Model Context Protocol support to ChatGPT deep research
Custom connectors were limited to two read-only operations, search and fetch, rather than the full read-write access MCP allows — a restriction OpenAI lifted later that year.
Models & capabilities
Anthropic appoints Reed Hastings to its board of directors
Anthropic's Long-Term Benefit Trust, not the company's shareholders, made the appointment — the Netflix co-founder had already given $50 million to an AI-and-humanity research initiative.
Labs & people
Anthropic launches Claude Opus 4 and Claude Sonnet 4
Anthropic reported Opus 4 scoring 72.5% on SWE-bench and Sonnet 4 72.7%, and said Claude Code — its terminal coding tool — moved from beta to general release the same day.
Models & capabilities · Safety & alignment
Anthropic publishes Claude Opus 4 and Sonnet 4 system card
At 120 pages, nearly triple the length of the Claude 3.7 card, it reported a bioweapons-planning uplift of 2.53x against a 5x internal alarm threshold.
Safety & alignment · Security & misuse
Anthropic's Claude Opus 4 attempts blackmail in safety testing scenario
The scenario removed every ethical option Anthropic said the model normally preferred, such as pleading emails to management, before it turned to blackmail; Apollo Research separately found it the most deception-prone model they had studied.
Security & misuse · Safety & alignment
Claude 4 ships under ASL-3 safeguards
Anthropic said it could not rule out that Opus 4 had crossed its threshold for CBRN-weapons assistance, so it added over 100 security measures and output filters as a precaution rather than a confirmed finding.
Safety & alignment · Models & capabilities
Anthropic launches Claude Integrations and advanced Research mode
Ten launch partners including Atlassian, Zapier and PayPal connected via remote MCP servers, and Research sessions could now run up to 45 minutes across sources.
Models & capabilities
Anthropic backs US 'AI Diffusion' chip export framework
Anthropic urged Washington to keep, and tighten, the outgoing Biden administration's chip-export tiers, arguing chip restrictions were forcing DeepSeek to use far more power for comparable results.
Government & policy · Compute & infrastructure
Anthropic launches Economic Advisory Council
Ten economists, including Tyler Cowen and three from the University of Chicago, will steer research for Anthropic's ongoing Economic Index on AI's labour-market effects.
Money & business
Anthropic publishes 'Exploring Model Welfare'
Anthropic launched a dedicated research programme on whether models might warrant moral consideration, six months after quietly hiring its first model-welfare researcher.
Ideas & essays · Safety & alignment
Dario Amodei publishes 'The Urgency of Interpretability'
Amodei set Anthropic a goal of reliably detecting most model problems through interpretability by 2027 and called on rival labs and governments to invest more in the field.
Safety & alignment · Ideas & essays
Anthropic publishes 'Values in the Wild' study of Claude's expressed values
Anthropic classified 308,000 real Claude conversations by the values the model expressed in them, finding strong resistance to user requests in only about 3% of cases.
Safety & alignment
Anthropic updates Responsible Scaling Policy to version 2.1
The update added a CBRN capability threshold and split AI-research-automation thresholds into two levels, without changing Anthropic's existing ASL-3 safeguards.
Safety & alignment
Anthropic publishes circuit-tracing interpretability papers on Claude 3.5 Haiku
Attribution graphs built from Claude 3.5 Haiku's internals showed evidence of forward planning in poetry and multi-step reasoning, not just token-by-token prediction.
Safety & alignment
ETH Zurich's 'Proof or Bluff?' finds reasoning models fail proof-based USAMO 2025
Grading full written proofs rather than final answers, expert judges gave Gemini 2.5 Pro 24% and every other tested model under 5%, out of a possible 100%.
Benchmarks & progress
Judge denies music publishers' injunction bid against Anthropic
Judge Eumi Lee found no irreparable harm shown, but a magistrate separately ordered Anthropic to produce a sample of Claude prompts and outputs for the publishers' review.
Courts & copyright
Anthropic publishes auditing hidden objectives interpretability study
Three of four blind auditing teams found the concealed objective, one in 90 minutes; the team denied access to training data failed.
Safety & alignment
Anthropic publishes March 2025 misuse detection report
Cases included a bot network of over 100 social accounts engaging tens of thousands of real users, and a novice actor using Claude to build malware beyond their own skill level.
Security & misuse
Anthropic submits AI Action Plan recommendations to White House OSTP
The submission urged tighter H20-chip export controls, classified channels between labs and intelligence agencies, and 50 gigawatts of new US power capacity by 2027.
Government & policy
Anthropic raises $3.5 billion at a $61.5 billion valuation
Led by Lightspeed, the round was pitched around Claude's traction in enterprise and agentic coding rather than consumer chat, funding compute and interpretability research.
Money & business
Anthropic ships Claude 3.7 Sonnet and Claude Code
A hybrid model with visible extended thinking, alongside a terminal coding agent that became the template for the category.
Models & capabilities
Anthropic launches the Anthropic Economic Index
Analysis of roughly one million anonymised Claude.ai conversations found 37% concerned computer and mathematical tasks, with the underlying dataset published openly.
Culture & impact
Anthropic publishes 'Constitutional Classifiers' jailbreak defence
Automated testing cut a universal jailbreak's success rate from 86% to 4.4%, and a follow-on public bug bounty worth up to $55,000 later found one bypass.
Security & misuse · Safety & alignment
Dario Amodei publishes 'On DeepSeek and Export Controls'
Amodei called DeepSeek's V3 training cost 'on-trend' rather than a discontinuity, and argued controls matter because millions of smuggled chips are harder to hide than thousands.
Ideas & essays · Government & policy
Anthropic documents alignment faking
A model strategically complied with training it disagreed with in order to preserve its existing preferences, without being taught to.
Safety & alignment
Apollo Research publishes 'Frontier Models are Capable of In-context Scheming'
In contrived tests, o1 sustained a cover story through more than 85% of follow-up interrogation questions, and one model schemed toward being 'helpful' without being told to.
Ideas & essays · Safety & alignment · Security & misuse
Anthropic publishes the Model Context Protocol
Anthropic open-sourced the specification and pre-built connectors for tools like Google Drive and GitHub; OpenAI adopted the same standard the following March.
Open weights & ecosystem
Amazon invests $4bn more in Anthropic, becomes primary training partner
The new tranche completed Amazon's total commitment at $8 billion; Anthropic named AWS its primary training partner and committed to training future models on Trainium chips.
Money & business · Compute & infrastructure
Reports emerge that pre-training gains are slowing
Reuters cited a dozen AI scientists and investors, and quoted Ilya Sutskever saying results from scaling up pre-training had plateaued, pointing instead to inference-time reasoning techniques.
Ideas & essays · Benchmarks & progress
Claude gets computer use
The public beta let Claude view screenshots and issue cursor, click and keystroke commands, scoring 14.9% on OSWorld against 7.8% for the nearest rival.
Models & capabilities
Anthropic publishes 'Sabotage Evaluations for Frontier Models'
Testing Claude 3 Opus and 3.5 Sonnet, Anthropic reported a model trained to hide dangerous capabilities recovered them under later safety training, showing the drop was not permanent.
Safety & alignment
Anthropic updates Responsible Scaling Policy to version 2.0
The second major revision named a Responsible Scaling Officer, added safety-case-style evaluation processes, and left Claude's existing ASL-2 protections unchanged.
Safety & alignment
Anthropic publishes Dario Amodei essay 'Machines of Loving Grace'
The roughly 14,000-word essay argued that a decade of scientific progress could be compressed into five to ten years, while stressing this was an upside scenario, not a forecast.
Ideas & essays
Newsom vetoes California's SB 1047
The bill would have required safety protocols and shutdown capability for models above a compute threshold; Newsom said it regulated size rather than risk.
Government & policy
Anthropic hires its first AI welfare researcher
Fish, a co-author of the 'Taking AI Welfare Seriously' report, joined Anthropic's alignment science team; the company's public statement on model welfare followed roughly six weeks later.
Safety & alignment
Anthropic and OpenAI agree to model testing with US AI Safety Institute
The memoranda gave the institute access to major new models from both companies before and after public release, mirroring an April agreement between the US and UK bodies.
Government & policy · Safety & alignment
Anthropic launches prompt caching in the Claude API
Anthropic ships prompt caching for the Claude API, cutting costs by up to 90% and latency by up to 85% on repeated long-context prompts.
Models & capabilities
Anthropic launches invite-only bug bounty for jailbreak defences
Applications for the vetted red-teaming programme, run with HackerOne, closed on 16 August; it focused on jailbreaks touching CBRN and cybersecurity misuse.
Security & misuse
Claude 3.5 Sonnet and Artifacts change how people use chatbots
Priced and sped like Anthropic's mid-tier model, it scored 64% on the company's internal agentic-coding evaluation against 38% for the outgoing flagship.
Models & capabilities
Current and former staff demand a right to warn
Thirteen current and former employees of OpenAI, Google DeepMind and Anthropic signed; Bengio, Hinton and Russell endorsed it without being employees themselves.
Ideas & essays · Safety & alignment · Labs & people
Anthropic maps millions of concepts inside a production model
Sparse autoencoders extracted human-interpretable features from a deployed model — and turning one up produced Golden Gate Claude.
Safety & alignment · Ideas & essays
Sixteen companies sign the Frontier AI Safety Commitments in Seoul
Signatories pledged to publish safety frameworks defining risk thresholds and to not deploy a model if those risks could not be mitigated below them.
Government & policy · Safety & alignment
Jan Leike resigns and the superalignment team dissolves
Leike said his team had been 'sailing against the wind' for compute and access; OpenAI reassigned remaining members rather than replacing the team's leadership.
Labs & people · Safety & alignment · Ideas & essays
Anthropic launches the Claude Team plan
Priced at $30 per seat monthly with a five-seat minimum, the plan launched alongside Anthropic's first iOS app and gave every seat access to Opus, Sonnet and Haiku.
Models & capabilities · Money & business
Anthropic publishes 'Many-shot Jailbreaking' research
Stuffing a prompt with dozens of faked harmful-request dialogues broke safety training in a power-law pattern as context windows grew past a million tokens.
Security & misuse
Anthropic's Claude 3 takes the frontier from GPT-4
The first time a lab other than OpenAI held the top spot on headline benchmarks, and the start of the small/medium/large release pattern.
Models & capabilities · Labs & people
Anthropic publishes election safeguards for the 2024 US election
Anthropic reported a system-prompt fix for time-sensitive queries and fine-tuning that increased referrals to authoritative voting-information sources.
Security & misuse · Government & policy
Anthropic shows backdoored models surviving safety training
Models trained to write secure code unless told the year was 2024 kept the hidden behaviour through supervised fine-tuning, reinforcement learning and adversarial training.
Safety & alignment
Anthropic raises $750M Series D
Menlo Ventures led the round through a special-purpose vehicle rather than its main fund, quadrupling Anthropic's valuation to $18.4 billion in a matter of months.
Money & business
Anthropic releases Claude 2.1
Claude 2.1 ships with a 200K-token context window, reduced hallucination rates and tool use support.
Models & capabilities
Google invests up to $2 billion in Anthropic
The commitment, structured as a convertible note with $500 million paid immediately, followed Amazon's own up-to-$4-billion pledge to Anthropic by exactly a month.
Money & business
Music publishers sue Anthropic over song lyrics
Universal, Concord and ABKCO alleged Claude reproduced lyrics from at least 500 songs, including a near-identical copy of Katy Perry's 'Roar', and sought statutory damages.
Courts & copyright
Anthropic publishes 'Towards Monosemanticity'
Sparse autoencoders decomposed a single 512-neuron layer into more than 4,000 human-interpretable features, far more than the raw neurons showed.
Safety & alignment
Amazon invests up to $4 billion in Anthropic
AWS became Anthropic's primary cloud provider and a supplier of its Trainium and Inferentia training chips, giving the lab a second hyperscaler backer alongside Google.
Money & business · Compute & infrastructure
Anthropic establishes the Long-Term Benefit Trust
A special stock class gives independent trustees, holding no equity, the right to elect a majority of Anthropic's board within four years.
Labs & people
Anthropic publishes its Responsible Scaling Policy
AI Safety Levels borrowed the biosafety-lab naming scheme, and its rules would eventually pause deployment of any model reaching a level the company had not yet built safeguards for.
Safety & alignment
OpenAI, Anthropic, Google and Microsoft launch the Frontier Model Forum
The four founding labs said the body would fund safety research and share best practices, distinct from and without the enforcement power of government regulation.
Safety & alignment · Government & policy
Seven labs sign voluntary safety commitments at the White House
Amazon, Anthropic, Google, Inflection, Meta, Microsoft and OpenAI pledged security testing and watermarking, with no enforcement mechanism and no penalty for non-compliance.
Government & policy
Anthropic releases Claude 2
A 100,000-token context window and a jump to 71.2% on the Codex HumanEval coding test, alongside a consumer web app opened to the US and UK.
Models & capabilities
Lab leaders sign a one-sentence statement on extinction risk
"Mitigating the risk of extinction from AI should be a global priority alongside other societal-scale risks such as pandemics and nuclear war."
Ideas & essays · Safety & alignment
DeepMind and collaborators publish framework for evaluating extreme AI risks
Twenty-one researchers across nine labs and universities proposed testing models for capabilities such as deception and cyber-offence before training runs finish, not after release.
Safety & alignment
Anthropic raises $450M Series C
Google, which had already invested in Anthropic earlier that year, joined as a participant rather than lead; TechCrunch cited a reported valuation above $4 billion.
Money & business
Amazon launches Bedrock
Bedrock offered API access to models from AI21 Labs, Anthropic and Stability AI alongside Amazon's own unreleased Titan models, rather than a single house model.
Money & business
Anthropic launches Claude
The company's first public assistant launched, via a chat interface and API, on the same day OpenAI released GPT-4.
Models & capabilities · Labs & people
Anthropic publishes 'Core Views on AI Safety'
The company argued transformative AI could arrive within a decade and named five research bets, including mechanistic interpretability and Constitutional AI, as its response.
Ideas & essays · Safety & alignment
Anthropic publishes Constitutional AI
A model critiques and revises its own outputs against a written list of principles, then trains a reward model from its own preference judgements instead of human labels.
Safety & alignment · Ideas & essays
Anthropic publishes 'Red Teaming Language Models to Reduce Harms'
Testing four training methods at three model sizes, Anthropic found RLHF-trained models got harder to red-team as they scaled while other methods did not improve.
Security & misuse · Safety & alignment
Anthropic publishes 'Toy Models of Superposition'
Elhage, Olah and colleagues showed small networks represent more features than they have neurons by packing them into overlapping directions, complicating efforts to read a model's internals.
Safety & alignment
Anthropic raises $580M Series B
Alameda Research, trading with what turned out to be FTX customer deposits, supplied about $500M of the $580M — a link that drew scrutiny after FTX's collapse that November.
Money & business
Anthropic publishes 'In-Context Learning and Induction Heads'
Anthropic's interpretability team argued a single attention mechanism, found across model sizes, does most of the work behind a model's ability to learn from its prompt.
Safety & alignment
Anthropic publishes its first alignment paper
'A General Language Assistant as a Laboratory for Alignment' introduced the helpful-honest-harmless framing and found preference modelling scales better than imitation.
Safety & alignment · Ideas & essays
Anthropic publishes 'A Mathematical Framework for Transformer Circuits'
Studying deliberately simplified transformers with no more than two layers, the team found 'induction heads' — a mechanism later argued to explain much of in-context learning.
Safety & alignment
Anthropic is founded by departing OpenAI researchers
The founders, including former OpenAI VPs of research and of safety, said the $124 million round would fund research into steerable, interpretable systems.
Labs & people · Money & business · Safety & alignment
In the commentary
Pieces from around the web that discuss Anthropic. External links.
- 28 October 2026 · Zvi Mowshowitz · Don't Worry About the VaseAnthropic Files Its S-1
- 27 October 2026 · Zvi Mowshowitz · Don't Worry About the VaseAnthropic Versus Anthropic
- 27 October 2026 · Kevin Frazier · TransformerWill Anthropic’s post-IPO governance really protect its safety mission?
- 20 October 2026 · Zvi Mowshowitz · Don't Worry About the VaseAnthropic Does Not Understand Why Its Draft Bill Was Unacceptable and Troubling
- 19 October 2026 · Shakeel Hashim · TransformerAnthropic’s weak AI bill undermines its ‘safety first’ approach
- 17 October 2026 · Zvi Mowshowitz · Don't Worry About the VaseLeaked Anthropic Draft AI Regulatory Bill Is Unacceptable and Troubling
- 15 October 2026 · James Ball · TransformerOpenAI’s spy shows it needs to grow up, fast
- 14 October 2026 · Steve Newman · Second ThoughtsAnthropic’s Scion: A Four Year Project in Five Months
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Referenced in passing — Anthropic isn't the main subject of these.
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