[BUG] ⏺ API Error: 400 tools.11.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?

Trying to use the latest Fable 5 model.
Since it is not available in my Claude App / CLI, I was trying this workaround:

1. I resume my chat session in the claude cli, and enable remote control /rc
2. then /rc gives me the URL where I can resume the chat session from their web version
3. and in that web version I can select Fable 5 model

But then I get the error/warning:
⏺ API Error: 400 tools.11.model: 'claude-opus-4-8' cannot be used as an advisor when the request model is 'claude-fable-5'.

What Should Happen?

It should work

Error Messages/Logs

Steps to Reproduce

1. I resume my chat session in the claude cli, and enable remote control /rc
2. then /rc gives me the URL where I can resume the chat session from their web version
3. and in that web version I can select Fable 5 model

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.11187.4 (584005)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_