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GitHub Blog
Claude Fable 5 is generally available for GitHub Copilot
Claude Fable 5, from Anthropic, has been integrated into GitHub Copilot, marking its availability for users including Copilot Pro+, Max, Business, and Enterprise plans. This model is tailored for autonomous coding workflows, showcasing its efficiency in less tool calls and token consumption compared to prior models. Notably, Claude Fable 5 includes a data retention policy intended to enhance safety classifiers, retaining data for 30 days to monitor for potential misuse before deletion.
MonitorConfidence: MediumShort term horizon
Published 9 Jun 2026, 17:45 UTC2 min read
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Summary
TL;DR
- Claude Fable 5 is the first model from Anthropic's Mythos class.
- It enhances autonomous coding and knowledge-work tasks within GitHub Copilot.
- The model requires data retention for operating safety classifiers.
- Available to users of Copilot Pro+, Max, Business, and Enterprise plans.
- Previous models maintain a Zero Data Retention policy.
Interesting facts
- Claude Fable 5 completed tasks more efficiently than previous models.
- The model is part of a gradual rollout for GitHub Copilot users.
Coverage gaps