[BUG] There's an issue with the default model (claude-sonnet-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?

Claude Code version (claude --version)
Plan type (Pro)
Whether /model shows claude-sonnet-5 in the list or not: it does. here=
> 1. Default (recommended) √ Sonnet 5 · Efficient for routine tasks

1. Sonnet Sonnet 5 · Efficient for routine tasks
2. Fable Fable 5 · Most capable for your hardest and longest-running tasks · Requires usage credits
3. Opus Opus 5 · Best for everyday, complex tasks · ~2× usage vs Sonnet
4. Haiku

Whether other models (Opus, Haiku) work fine or fail the same way: yes. they fail the same way. Take a look= There's an issue with the selected model (claude-opus-5). It may not exist or you may not have access to it. Run /model to pick a different model.
and = There's an issue with the selected model (claude-haiku-4-5-20251001). It may not exist or you may not have access to it. Run /model to pick a different model.

What Should Happen?

fix the models because i need to work.

Error Messages/Logs

Steps to Reproduce

1. Run /model
2. Select any of the models
3. Press Enter
4. A list of models pop up and each selection gives the same error like in this:

There's an issue with the selected model (claude-sonnet-5). It may not exist or you may not have access to it. Run /model to pick a different model

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.221 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_