Claude Code v2.1.170 introduces Claude Fable 5 and fixes transcript bug
Claude Code `v2.1.170` ships access to Claude Fable 5, a new Mythos-class model, and fixes a bug where sessions launched from the VS Code integrated terminal failed to save transcripts or appear in `--resume`.
Score breakdown
The release pairs access to Anthropic's most capable generally available model to date with a fix for a session-continuity regression that affected VS Code integrated terminal users.
- 01Claude Code `v2.1.170` was released by ashwin-ant on 2026-06-09.
- 02The release introduces Claude Fable 5, described as a Mythos-class model.
- 03Anthropic states Fable 5's capabilities exceed those of any model it has previously made generally available.
Claude Code `v2.1.170` brings two notable changes. The headline addition is access to Claude Fable 5, a Mythos-class model that Anthropic describes as safe for general use and as exceeding the capabilities of any model it has previously made generally available. Users must update to `v2.1.170` to gain access to the new model.
The release also resolves a session persistence bug: transcripts were not being saved — and consequently not appearing when using the `--resume` flag — whenever Claude Code was launched from the VS Code integrated terminal or from any shell that had inherited Claude Code environment variables. This fix restores reliable session continuity for affected users.
Key facts
- 01Claude Code `v2.1.170` was released by ashwin-ant on 2026-06-09.
- 02The release introduces Claude Fable 5, described as a Mythos-class model.
- 03Anthropic states Fable 5's capabilities exceed those of any model it has previously made generally available.
- 04Fable 5 is described as safe for general use.
- 05Users must update to `v2.1.170` to access Claude Fable 5.
- 06A bug was fixed where sessions launched from the VS Code integrated terminal or shells inheriting Claude Code environment variables did not save transcripts.
- 07The transcript bug also caused affected sessions not to appear in `--resume`.
Topics
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