[BUG] ● API Error: 400 tools.13.model: 'claude-opus-4-8' cannot be used as an advisor when the request model is 'claude-fable-5'.

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?

● API Error: 400 tools.13.model: 'claude-opus-4-8' cannot be used as an advisor
when the request model is 'claude-fable-5'.

What Should Happen?

claude code should just ignore this error and proceed

Error Messages/Logs

● API Error: 400 tools.13.model: 'claude-opus-4-8' cannot be used as an advisor
  when the request model is 'claude-fable-5'.

Steps to Reproduce

just start claude code

Claude Model

Other

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

171

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_