Claude app release notes·· 2026-09-22
Claude Opus 5.5 launch
Claude Opus 5.5 launch
Brief overview
Anthropic released Claude Opus 5.5, a model that performs at the level of Claude Fable 5.1, with running costs 40% lower than Opus 5.
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Claude Opus 5.5 launch
We just launched Claude Opus 5.5, the first model in our new Claude 5.5 family. It performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5. For more information, see our blog post: Introducing Claude Opus 5.5.
Source: Claude app release notes · support.claude.com