GitHub announced Claude Fable 5.1, Anthropic’s latest Mythos-class model, is generally available in GitHub Copilot. Internal testing highlighted long-running coding, deep codebase research, and complex agentic workflows, and it is selectable in the Copilot app, CLI, and VS Code (@code).

Key Takeaways

  • ✓Claude Fable 5.1 is GA in GitHub Copilot, not preview-only.
  • ✓GitHub highlights long-running coding, codebase research, and agentic workflows.
  • ✓Available across Copilot App, CLI, and VS Code for existing Copilot setups.
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