Anthropic released Claude Opus 5.5 on September 22, 2026: 66.4% Terminal-Bench, 54.4% FrontierCode, matching Fable 5.1 at $4/$20 with 60% cheaper prompt caching.
Anthropic released Claude Opus 5.5 on September 22, 2026: 66.4% Terminal-Bench, 54.4% FrontierCode, matching Fable 5.1 at $4/$20 with 60% cheaper prompt caching.