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.
