[BUG] Fable 5 keeps downgrading to Opus 4.8 even when approved for Cyber Verification Program

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Fable 5 keeps downgrading to Opus 4.8 when entering benign prompts related to computer security even when "You have been approved into the Cyber Verification Program":

● Fable 5's safety measures flagged this message for cybersecurity or biology topics. They may flag safe, normal content as well. 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

API Error: Claude Code is unable to respond to this request, which appears to violate our Usage Policy (https://www.anthropic.com/legal/aup). This request triggered restrictions on violative cyber content and was blocked under Anthropic's Usage Policy. To request an adjustment pursuant to our Cyber Verification Program based on how you use Claude, fill out https://claude.com/form/cyber-use-case?token… Please double press esc to edit your last message or start a new session for Claude Code to assist with a different task.

Request ID: req_011CbtS9SJLarzhLgyr2uCAF

What Should Happen?

Fable 5 should work and not downgrade to Opus 4.8.

Error Messages/Logs

from:	Anthropic <no-reply-HIDzl0qz7MWQtFgt6AZDBA@mail.anthropic.com>
reply-to: Anthropic <no-reply-HIDzl0qz7MWQtFgt6AZDBA@mail.anthropic.com>
to: james@jamesthornton.com
date:	Jun 9, 2026, 5:31 PM
subject:	You have been approved into the Cyber Verification Program!
mailed-by:	em9672.mail.anthropic.com
signed-by:	mail.anthropic.com
security:	 Standard encryption (TLS) [Learn more](https://support.google.com/mail?hl=en&p=tls)

❯ yes, implement stage F end to end. 

● Fable 5's safety measures flagged this message for cybersecurity or biology topics. They may flag safe, normal content as well. 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

---

● API Error: Claude Code is unable to respond to this request, which appears to violate our Usage Policy (https://www.anthropic.com/legal/aup). This request triggered restrictions on violative cyber content and was blocked under Anthropic's Usage Policy. To request an adjustment pursuant to our Cyber
  Verification Program based on how you use Claude, fill out https://claude.com/form/cyber-use-case?token=… Please double press esc to edit your last message or start a
  new session for Claude Code to assist with a different task.

  Request ID: req_011CbtQADbtyQ1t7MXnZC2YP

✻ Cooked for 5s

❯ Create the design doc.                                                                                                                                                                                                                                                                                                     

● API Error: Claude Code is unable to respond to this request, which appears to violate our Usage Policy (https://www.anthropic.com/legal/aup). This request triggered restrictions on violative cyber content and was blocked under Anthropic's Usage Policy. To request an adjustment pursuant to our Cyber Verification Program based on how you use Claude, fill out https://claude.com/form/cyber-use-case?token=… Please double press esc to edit your last message or start a new session for Claude Code to assist with a different task.

  Request ID: req_011CbtQC85KBg7UcSknZHYmM

✻ Sautéed for 6s

※ recap: Goal: let the gateway and peers verify a full-tier Windows bitwav-peer. We just settled that the process-protection driver can be an ordinary signed boot-start driver using ObRegisterCallbacks, not gated ELAM. Next: write the DESIGN.md on your go.

❯ Create the design doc.                                                                                                                                                                                                                                                                                                     

● API Error: Claude Code is unable to respond to this request, which appears to violate our Usage Policy (https://www.anthropic.com/legal/aup). This request triggered restrictions on violative cyber content and was blocked under Anthropic's Usage Policy. To request an adjustment pursuant to our Cyber
  Verification Program based on how you use Claude, fill out https://claude.com/form/cyber-use-case?token=… Please double press esc to edit your last message or start a new session for Claude Code to assist with a different task.

  Request ID: req_011CbtS9SJLarzhLgyr2uCAF

Steps to Reproduce

Enter a benign prompt related to computer security.

Claude Model

Other

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.170 (Claude Code)

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

Xterm

Additional Information

_No response_