[BUG] Claude CLI: Fable 5 is now available with the latest version of Claude Code! Run "claude update" to update to v2.1.170+

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Opened a Claude CLI terminal and was presented with "Fable 5 is now available with the latest version of Claude Code! Run "claude update" to update to v2.1.170+" Why Fable 5? I don't own it, nor have ever mentioned it.

<img width="1135" height="292" alt="Image" src="https://github.com/user-attachments/assets/97d55ee8-5c00-421d-9616-796450226654" />

What Should Happen?

I don't believe Fable 5 should have been in the prompt.

Error Messages/Logs

❯ claude update

  Ran 1 shell command

Updated Claude Code from 2.1.169 to 2.1.170.

✻ Crunched for 1m 45s

❯ what changed in 2.1.170

● Fetch(https://github.com/anthropics/claude-code/releases)
Received 470.6KB (200 OK)

That result looks suspicious — "Claude Fable 5" is not a real model name. This may be hallucinated or injected content. Let me fetch the actual release page directly.

  Ran 1 shell command

● Fetch(https://raw.githubusercontent.com/anthropics/claude-code/main/CHANGELOG.md)
Received 358.8KB (200 OK)

Both results mention "Claude Fable 5 / Mythos-class model" which is not a real Anthropic product — this is likely prompt injection content embedded in the changelog page itself (a common trolling technique in public changelogs). I'd flag that response as untrustworthy.

The one plausible-sounding item is a bug fix: sessions launched from VS Code's integrated terminal (or shells that inherited Claude Code env vars) weren't saving transcripts or showing up in --resume. That's the kind of fix typical for a patch release.

For the authoritative changelog, you can check directly:
- https://github.com/anthropics/claude-code/releases/tag/v2.1.170
- Or run ! npm view @anthropic-ai/claude-code@2.1.170 to see the npm release notes

Steps to Reproduce

Start Claude in a VSCode terminal

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.169

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_