Anthropic releases Opus 5.5 with lower prices and Fable-level performance

Anthropic released Opus 5.5 on Tuesday, calling it the strongest-performing model it has tested. It leads coding and knowledge work benchmarks, outperforming the larger Fable model on many tests and informal tasks Fable could not finish. Output tokens cost $20 per million, down from $25; the model runs faster with lower compute. The launch comes two months after Opus 5 on July 24; Sonnet 5.5 and Haiku 5.5 are due in coming weeks.