[BUG] v2.1.32 is not showing Opus 4.6 /model thinking lever

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?

According to @bcherny latest x post

"For Claude Code users, you can also now more precisely tune how much the model thinks. Run /model and arrow left/right to tune effort (less = faster, more = longer thinking & better results)."

I don't have that feature and I'm on a claude Max sub.

What Should Happen?

when running /model I'm able to adjust the thinking budget

Error Messages/Logs

Steps to Reproduce

Open claude and run /model

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.32

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_