Model
gpt-5.3-codex
Appears alongside
Featured in threads
Tracks
- Models & capabilities 2
- Security & misuse 1
- Open weights & ecosystem 1
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
OpenAI releases GPT-5.3-Codex-Spark, an ultra-low-latency coding model
Served on Cerebras' Wafer Scale Engine 3 rather than OpenAI's usual infrastructure, the smaller model hit over 1,000 tokens per second — about 15 times the standard Codex model's speed.
Models & capabilities
OpenAI releases GPT-5.3-Codex
OpenAI reported the model roughly doubled its predecessor's OSWorld-Verified computer-use score, from 38.2% to 64.7%, and was the first Codex model rated 'High capability' for cybersecurity tasks.
Models & capabilities