[Bug] Claude Code auto-switches to Opus 4.8 with Fable 5 model selection
Resolved 💬 2 comments Opened Jun 12, 2026 by laanemetslaur Closed Jun 15, 2026
Bug Description
Hi! I'm trying to use Fable 5 for Dairy farm analytics but I keep on getting Claude COde auto-swithing the model to Opus 4.8. "This model has measures that flagged something in this session. This sometimes happens with safe, normal conversations. 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"
Environment Info
- Platform: darwin
- Terminal: iTerm.app
- Version: 2.1.173
- Feedback ID: f567a49f-65be-41ea-9dec-83b413fe6cb8
Errors
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