Claude Fable 5 from Anthropic is now available in GitHub Copilot, the first model in Anthropic’s Mythos class, designed for long-horizon, autonomous coding and knowledge-work tasks. Unlike other Claude models in GitHub Copilot, Claude Fable 5 requires data retention to operate Anthropic’s safety classifiers. Continue reading for more details. In our internal benchmarks on autonomous coding workflows, Fable 5 completed equivalent work with fewer tool calls and lower token consumption than previous Opus-tier models.
This model is billed at provider list pricing under Usage Based Billing. See GitHub Copilot’s pricing for models and requests for details.
Claude Fable 5 will be available to Copilot Pro+, Max, Business, and Enterprise users. You’ll be able to select the model in the model picker in:
Rollout will be gradual. Check back soon if you don’t see it yet.
Copilot Enterprise and Copilot Business plan administrators must enable the Claude Fable 5 policy in Copilot settings. The policy is off by default.
Important: Claude Fable 5 requires data retention. As part of Anthropic’s safety architecture for this model, Anthropic retains prompts and outputs for up to 30 days to operate safety classifiers that detect harmful or abusive use. After 30 days, it deletes the prompts and outputs. Retained data is not used to train Anthropic’s models.
This data retention applies only to Claude Fable 5. All other Claude models in GitHub Copilot, including Claude Opus 4.8, Sonnet 4.5, and Haiku 4.5, continue to operate under Zero Data Retention (ZDR).
For more on how Anthropic handles this data, see Anthropic’s commercial terms and data retention policy. Enabling the Claude Fable 5 policy constitutes acknowledgement of this requirement. Leaving it off keeps Claude Fable 5 unavailable to your organization.
To explore all models available in GitHub Copilot, see our documentation on models and get started with Copilot.
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