News: Claude Opus 5.5
Claude Opus 5.5 tops the Intelligence Index on September 22, 2026
On September 22, 2026, Artificial Analysis scored Claude Opus 5.5 at 58 on its Intelligence Index at max effort.
Anthropic Claude Opus 5.5 release on September 22, 2026: what's new
Claude Opus 5.5 release: Anthropic shipped the model on September 22, 2026, at Fable 5.1 level on most work.