[Bug] Fable 5 model safety filters causing false positives on benign messages

Resolved 💬 2 comments Opened Jun 9, 2026 by xia0maiiii Closed Jun 13, 2026

Bug Description
Please tell me what you're doing. I just opened it and this is the case; it's unavailable. Please see: ➜ /tmp Claude

▐▛███▜▌ Claude Code v2.1.170

▝▜█████▛▘ Opus 4.8 with xhigh effort · Claude Max

▘▘ ▝▝ /private/tmp

▎ Meet Fable 5, our newest model for complex, long-running work. Try anytime with /model.

▎ Included in your plan limits until Jun 21, then switch to usage credits to continue.

❯ hi

⏺ Hi! What can I help you with today?

I have access to security audit tooling, code review, research, and general software engineering capabilities. What are you working on?

⏺ Fable 5's safety measures flagged this message for cybersecurity or biology topics. They may flag safe,
normal content as well. These measures let us bring you Mythos-level capability in other areas sooner, and
we're working to refine them. Switched to Opus 4.8. Send feedback with /feedback or learn more
⎿ Tip: You can configure model switch behavior in /config

Environment Info

  • Platform: darwin
  • Terminal: ghostty
  • Version: 2.1.170
  • Feedback ID: c7f91812-383b-48a6-8f37-e0fd0ec907fa

Errors

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