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
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.
Source Excerpt
Editor’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…
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