Anthropic: Claude Code v2.1.170 brings Fable 5 and fixes the --resume bug
Claude Code version 2.1.170, released June 9, 2026, introduces access to the new Claude Fable 5 model and fixes a bug where sessions launched from VS Code's integrated terminal failed to save transcripts — which prevented the --resume flag from working.
This article was generated using artificial intelligence from primary sources.
On June 9, 2026 at 17:23 UTC, Anthropic released Claude Code v2.1.170. This is a minor release that follows the day-one launch of Claude Fable 5, with one new feature and one bug fix.
Access to Claude Fable 5
The main new feature of version 2.1.170 is the introduction of access to Claude Fable 5 (claude-fable-5) within the Claude Code environment.
Fable 5 is Anthropic’s new Mythos-class model launching today, bringing improved capabilities across all domains — especially in code writing and analysis. Details on capabilities, pricing, and availability are described in the accompanying announcement on Anthropic’s blog.
To access Fable 5 in Claude Code, simply upgrade to version 2.1.170 — no manual model configuration is needed.
Fix: sessions from VS Code terminal were not saving transcripts
What was the problem?
Claude Code sessions launched from the VS Code integrated terminal (or any shell that had inherited Claude Code environment variables) were not properly saving conversation transcripts. The practical consequence: those sessions were not available when later using the --resume flag.
Users who preferred working within the VS Code environment rather than a standalone terminal were losing session history and the ability to resume interrupted work.
What caused the bug?
The root cause was an interaction with inherited environment variables. When VS Code’s integrated terminal launches Claude Code, the shell inherits certain Claude Code environment variables from the parent process — which was interfering with the transcript-writing logic and preventing proper storage.
Fix
Version 2.1.170 corrects this logic. Sessions launched from the VS Code terminal now properly:
- Save conversation transcripts
- Appear when the
--resumeflag is invoked
Upgrading to v2.1.170 is sufficient — no configuration changes or deletion of existing data are required.
How to upgrade
npm install -g @anthropic-ai/[email protected]
# or
claude updateUsers tracking the @latest tag will receive 2.1.170 automatically on their next install or update call.
Frequently Asked Questions
- What was fixed in Claude Code v2.1.170?
- A bug was fixed in which sessions launched from VS Code's integrated terminal, or any shell that had inherited Claude Code environment variables, failed to save conversation transcripts. As a result, those sessions were not visible when using the --resume flag.
- How do you activate Claude Fable 5 in Claude Code?
- Simply upgrade to version 2.1.170 — Fable 5 access comes automatically with the upgrade, with no additional configuration required.
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