Updates
1. Introducing Claude Opus 5.5
We're introducing Claude Opus 5.5, the first model in our new Claude 5.5 family.
Proof: It performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5.
Impact: It was tested before release by external evaluators, including Frontier Design and METR.
Watch next: Check Claude Opus 5.5 release notes for cost and performance updates.
Canonical host: www.anthropic.com