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Claude Fable 5.1 is generally available in GitHub Copilot

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GitHub·Sep 1, 2026, 02:29 PMFeatureAI-assisted summary

Summary

Claude Fable 5.1, Anthropic's latest Mythos model, is now generally available in GitHub Copilot.
Optimized for long‑horizon, autonomous coding and knowledge‑work tasks.
Provides developers with advanced AI assistance directly within the Copilot experience.

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Official source Last checked Sep 4, 2026, 3:03 AM

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