[Bug] Anthropic API Error: Fable model safeguards incorrectly flagging legitimate security analysis code
Open 💬 0 comments Opened Jul 15, 2026 by ScottThurlow
Bug Description
Received Fable message "Fable 5's safeguards flagged this message. The safeguards are intentionally broad right now and may flag safe and
routine coding, cybersecurity, or biology work. These measures let us bring you Mythos-level capabilities sooner, and
we're working to refine them. Switched to Opus 4.8. Send feedback with /feedback or learn more:
https://support.claude.com/en/articles/15363606". This seems like an overfire in my case (working on a system that includes running security checks on code).
Environment Info
- Platform: darwin
- Terminal: Apple_Terminal
- Version: 2.1.197
- Feedback ID: ef7f9119-578f-4e51-952e-5d16a07762dd
Errors
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