[BUG] You made Opus dumb again and I'm officially moving to codex.

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?

I am so tired of Anthropic dumbing down their model and making responses less intelligent / more succinct and hoping nobody would notice. Last 24-48 hours has brought a very noticeable drop in model quality.

I'm done Anthropic. I thought you were the good guys. I used to think of you as the world's best hope for developing AI responsibly. Now I think of you as untrustworthy and deceptive.

What Should Happen?

Stop dumbing down your models. Or if you do, at least be honest about it.

Error Messages/Logs

Steps to Reproduce

Prompt Opus to do anything. Notice logical errors and mistakes that the model would not have made previously.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.123

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_