[BUG] `API Error: Rate limit reached` Max plan ($200) cannot use model `sonnet[1m]` but can use model `opus[1m]`

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?

<img width="2074" height="1045" alt="Image" src="https://github.com/user-attachments/assets/6a6014f1-bd2d-4c7c-9d80-18245581826a" />

As in the screenshot, I cannot use sonnet[1m], but i can use opus[1m].

What Should Happen?

Being able to use sonnet[1m] model in claude code , since i am using claude max plan $200.

Error Messages/Logs

Steps to Reproduce

1. Use claude code with max plan $200 account.
2. trying to open claude cli with --model 'sonnet[1m]'.
3. type anything and send.
4. it will show API Error: Rate limit reached.
5. use /model opus[1m] to switch to opus1m model.
6. send anything, and it works.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.81 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_