[Bug] Anthropic API Error: Opus 5 safeguards flagging all messages with reasoning_extraction error

Bug Description
No matter what I do or say, everything I try to do with Opus (Claude Code cli on Ubuntu Linux), I get the following error message.

API Error: Opus 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 Opus 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/16049681

Details: [reasoning_extraction]

Request ID: req_011CfAAM3s9t5Djx1PmMdzbE

I have tried compacting. It just started happening today, and happens across every session I have open. It can't be because of one particular session.

Environment Info

• Platform: linux
• Terminal: vte-based
• Version: 2.1.275
• Feedback ID: 5e4dc5aa-e90d-4d8c-9017-7726fa9c19ae

Errors

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