Claude Code v2.1.170: Claude Fable 5 Model Access and VS Code Session Fix
Claude Code v2.1.170 introduces Claude Fable 5, a new Mythos-class model that Anthropic has deemed safe for general use. According to the release, Fable's capabilities exceed those of any model previously made generally available. The update also fixes a session-saving bug affecting VS Code integrated terminal users.
Key Changes
- Claude Fable 5 (Mythos-class): New high-capability model, safer for general deployment. Capabilities surpass all prior generally available models. Requires updating to v2.1.170 for access.
- Session Transcript Fix: Sessions launched from the VS Code integrated terminal (or any shell inheriting Claude Code environment variables) were not saving transcripts and failed to appear in
--resumeoutput. This is now fixed.
Getting the Update
Update Claude Code to version 2.1.170 to access Claude Fable 5. If you're using VS Code's integrated terminal, the session fix is especially relevant — your transcripts will now persist correctly.
Who This Affects
All Claude Code users interested in evaluating new models, and anyone relying on --resume for session continuity, particularly those using VS Code or custom shell environments that propagate Claude Code env vars.
📖 Read the full source: GitHub Claude-Code
👀 See Also
Tolan's AI-Enabled Engineering Interview Process
Tolan has redesigned their engineering interview to mirror day-to-day work with AI coding agents. Candidates get a few hours to build a feature from a Figma spec or short specification, using AI tools like Claude, Codex, Cursor, or Gemini.
Vibe Coding vs. Production Reality: The Undiscussed Liabilities
Reddit user External_Bobcat8183 highlights the gap between fast PoCs with vibe coding and real production issues: auth, secrets, GDPR, rate limiting, multi-tenancy.
Windows 11 2026 Update: Taskbar Repositioning, Reduced Copilot, File Explorer Improvements
Microsoft is rolling out Windows 11 updates in 2026 that restore taskbar repositioning, reduce Copilot clutter in core apps, and improve File Explorer performance based on user feedback.
Merlin Research releases Qwen3.5-4B-Safety-Thinking model for structured reasoning
Merlin Research has released Qwen3.5-4B-Safety-Thinking, a 4 billion parameter safety-aligned reasoning model built on Qwen3.5. The model is designed for structured 'thinking' and safety in real-world scenarios including agent systems.