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Home/Models & Labs
Models & Labs

Claude Fable 5.1 Now in GitHub Copilot

GitHub Changelog·September 1, 2026·high confidence

Why it matters

  • →Claude Fable 5.1 enhances GitHub Copilot with advanced capabilities for complex coding tasks.
  • →The model's data retention requirement introduces new considerations for enterprise users.
  • →This release signifies a deeper integration of AI into mainstream development tools.
Claude Fable 5.1 Now in GitHub Copilot
©GitHub Changelog

Anthropic's Claude Fable 5.1 model is now generally available in GitHub Copilot, aimed at improving long-horizon coding and knowledge tasks. The model is part of Anthropic's Mythos class and is designed for deep codebase research and complex workflows. Unlike previous models, Claude Fable 5.1 requires data retention by default to operate safety classifiers, although zero data retention is available for eligible enterprise customers. This integration into GitHub Copilot represents a significant enhancement for developers seeking advanced AI support in their coding environments.

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