🔬 research2026-09-23T00:00:00.000Z
Claude Opus 5.5: Fable 5.1 Performance at 40% Less Cost, the First Release After the Pacing Call
On September 22, 2026, Anthropic released Claude Opus 5.5 — the first model in the Claude 5.5 family, delivering Fable 5.1-level performance at 40% lower cost than Opus 5, with best-in-class safety scores, preserved thinking anti-distillation safeguards, and the first release since CEO Dario Amodei's call for frontier pacing.
#anthropic#claude#opus-5-5#pacing#safety#agentic-coding