Claude Fable 5.1 is generally available in GitHub Copilot

GASep 1, 2026VerifiedAdded Sep 22, 2026

Claude Fable 5.1 from Anthropic is now available in GitHub Copilot. The latest model in Anthropic’s Mythos class, Claude Fable 5.1 is designed for long-horizon, autonomous coding and knowledge-work tasks.

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Read GitHub's release notes

https://github.blog/changelog/2026-09-01-claude-fable-5-1-generally-available-in-github-copilot

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

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