Model
claude-mythos-5.1
Appears alongside
Featured in threads
Tracks
- Safety & alignment 3
- Models & capabilities 3
- Security & misuse 2
- Benchmarks & progress 2
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 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 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 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 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