Claude has a setting many people leave enabled by default.

Claude has a setting many people leave enabled by default.

It allows Fable → Opus fallback when a safety check is triggered. You can disable it in 3 places:

1. Chat
   Open Settings → Capabilities
   Find Switch models when a message is flagged
   Turn the toggle off

2. Claude Code
   Open Settings → Claude Code
   Turn the same toggle off

3. Console
   Run:
   /config switchModelsOnFlag=false

If the safety check is triggered, Claude will stop the chat instead of continuing the response on Opus.