Claude Opus 5.5: The System Card

Introducing the world's most powerful model, at least by some measures like Artificial Analysis or any standard benchmark list, which is now Claude Opus 5.5.

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2026-09-23 21:08 · Don't Worry About the Vase (Zvi)
Claude Opus 5.5: The System Card

More stories

GPT-6 Sol and Luna now available on AI Gateway — Vercel Blog
Sam Altman’s remarks at the United Nations Security Council — OpenAI News
Anthropic launches Claude Opus 5.5 with stricter safeguards for cybersecurity — The Verge AI
Moonshot’s Kimi K3 lands on Amazon in key test for Chinese open-source AI revenue — South China Morning Post Tech
Anthropic and OpenAI roll out cheaper models in first release since call for slowdown — CNBC Technology
Claude Opus 5.5 now available on AI Gateway — Vercel Blog
AI for coding? — r/artificial
Summary of METR's predeployment evaluation of Claude Opus 5.5 — METR

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