Claude Fable 5.1 is generally available in GitHub Copilot

AllisonGitHub ChangelogPublished Sep 3, 2026, 12:49 AM0 reads

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. … The post Claude Fable 5.1 is generally available in GitHub Copilot appeared first on The GitHub Blog.

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