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Claude Fable 5.1 and Claude Mythos 5.1 launched

GAVerifiedAdded Sep 22, 2026

Anthropic launched Claude Fable 5.1 and Claude Mythos 5.1, described as its most advanced models for coding and knowledge work.

Read Anthropic's release notes

https://support.claude.com/en/articles/12138966-release-notes#h_5988563685

Summaries of vendors' own notes. Product names and logos belong to their owners; logos via logo.dev.

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