Models & Labs
Claude Code v2.1.170 Release
Claude Code Releaseshigh confidence
Why it matters
- →Claude Fable 5 offers unprecedented capabilities for developers using Claude Code.
- →The update resolves a critical issue with session transcript saving, improving reliability.
- →This release marks a significant enhancement in both model performance and platform stability.
Claude Code has released version 2.1.170, featuring the new Claude Fable 5 model, which is part of the Mythos-class and now safe for general use. This model is the most capable ever made generally available by the company. The update also fixes a bug where session transcripts were not saving when launched from specific environments like the VS Code integrated terminal. This release enhances both the model's capabilities and the platform's reliability for developers.
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
- 1Claude Fable 5 now available in GitHub Copilot
GitHub Changelog · June 9, 2026 · Same story
- 2Claude Mythos 5 and Fable 5 Released
Duncan Rogoff · June 9, 2026 · Same story
What happened next
- 3Claude Code v2.1.173 Release Fixes Key Issues
Claude Code Releases · June 18, 2026 · Same story
- 4Claude Fable 5.1 Now in GitHub Copilot
GitHub Changelog · September 1, 2026 · Same story
- 5Claude Code v2.1.257 Release
Claude Code Releases · September 2, 2026 · Same story
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