[Bug] Anthropic API Error: Fable 5 safeguards falsely flagging safe messages
Status Open
Reported on v2.1.237
Maintainer reply None cached
Activity 0 comments · opened Aug 20, 2026
Bug Description
fable is currently unusable because with every second message it gives me this error. Even the safest prompts with no exploitation or whatever! API Error: Fable 5's safeguards flagged this message (https://www.anthropic.com/legal/aup). This sometimes happens with safe, normal conversations. Claude Code can't respond to this message with Fable 5.
Double press esc to edit your last message, or try a different model with /model.
Send feedback with /feedback or learn more: https://support.claude.com/en/articles/15363606
Details: [reasoning_extraction]
Request ID: req_011CeDpLqt3THEwBYjQqWnGh. I get this in all prompts be it a web search, changing things via api in gitlab etc.!!!
Environment Info
- Platform: darwin
- Terminal: xterm-256color
- Version: 2.1.237
- Feedback ID: 34d5bb22-82d3-40c8-b0ab-62e0c1e5a784
Errors
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