Models & Labs
Claude Fable 5 now available in GitHub Copilot
GitHub Changeloghigh confidence
Why it matters
- →Claude Fable 5 introduces a new approach to data retention for safety in AI models.
- →It enhances coding efficiency with fewer tool calls and lower token consumption.
- →This model expands the capabilities of GitHub Copilot for enterprise users.
Anthropic's Claude Fable 5 model is now available in GitHub Copilot, marking the first Mythos class model designed for autonomous coding and knowledge tasks. Unlike previous models, Claude Fable 5 requires data retention for up to 30 days to operate safety classifiers, a departure from the zero data retention policy of other Claude models. This model is available to Copilot Pro+, Max, Business, and Enterprise users and promises more efficient coding with fewer tool calls. The rollout will be gradual, and administrators must enable the policy to access the model.
Read originalThe story around this
Earlier coverage that leads up to this article, and what followed. Lines connect each piece to the closest one after it, converging here.
How we got here
- 1Anthropic Releases Official Claude Code Learning Resources
Duncan Rogoff · April 20, 2026 · Related
- 2Microsoft Cancels Claude Code Licenses
The Verge AI · May 14, 2026 · Related
- 3Anthropic Launches Claude Fable 5 and Mythos 5
Anthropic · June 9, 2026 · Related
- 4Anthropic Releases Claude Fable 5 with Safety Measures
WIRED AI · June 9, 2026 · Related
What happened next
- 5Claude Code v2.1.170 Release
Claude Code Releases · June 12, 2026 · Same story
- 6Claude Fable 5 Capabilities Explored
The AI Advantage · June 12, 2026 · Same story
- 7Claude Opus 5 Now in GitHub Copilot
GitHub Changelog · July 24, 2026 · Same story
- 8Claude Fable 5.1 Now in GitHub Copilot
GitHub Changelog · September 1, 2026 · Same story
- 9Anthropic launches Claude Fable 5.1 model
The Rundown AI · September 2, 2026 · Same story
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