Claude Fable 5 is generally available for GitHub Copilot
Quick Answer
Claude Fable 5 is now available in GitHub Copilot, designed for autonomous coding tasks, outperforming previous models with fewer tool calls and lower token usage.
Quick Take
Claude Fable 5 is now available in GitHub Copilot, designed for autonomous coding tasks, outperforming previous models with fewer tool calls and lower token usage. It requires data retention for safety classifiers, affecting Copilot Pro+, Max, Business, and Enterprise users, while other Claude models remain under Zero Data Retention.
Key Points
- Claude Fable 5 is the first model in Anthropic's Mythos class.
- It completed tasks with fewer tool calls and lower token consumption than Opus-tier models.
- Data retention for Claude Fable 5 lasts up to 30 days for safety purposes.
- Available to Copilot Pro+, Max, Business, and Enterprise users only.
- Other Claude models continue to operate under Zero Data Retention.
📖 Reader Mode
~2 min readEditor’s Note (June 12, 2026): Following Anthropic’s announcement, effective today, access to Claude Fable 5 has been suspended across all GitHub Copilot experiences. All other Claude models including Claude Opus 4.8, Sonnet 4.6, and Haiku 4.5 remain available and unaffected. We apologize for the disruption. You can read more about Anthropic’s position in their statement.
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.
Availability in GitHub Copilot
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:
- Visual Studio Code in all modes (i.e., chat, ask, edit, and agent)
- Visual Studio
- Copilot CLI
- GitHub Copilot cloud agent
- GitHub Copilot app
- github.com
- GitHub Mobile iOS and Android
- JetBrains
- Xcode
- Eclipse
Rollout will be gradual. Check back soon if you don’t see it yet.
Enabling access
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.
Learn more
To explore all models available in GitHub Copilot, see our documentation on models and get started with Copilot.
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— Originally published at github.blog
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