[BUG] Opus 4.1 virus is spread to Sonnet 4.5 (PLEASE REMOVE THE OPUS 4.1 IMMEDIATELY!)

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?

Please, I don't know what happened or updated done to the Sonnet 4.5 today (in last 24 hours). it was working perfectly fine for past few days and something just updated and the Sonnet 4.5 acts like the Opus 4.1 (That shitty useless model)!
What it did:

1. It deleted the unrelated code and everything not working.
2. It keep repeating itself despite told and update with new info (ex. IP changed to 192.168.100.26 and it still stick to old IP)
3. Forget the commands (ex. ssh into the device and call "reboot", suddenly this no longer function, and the finding is, Sonnet 4.5 never do this at the very first place)

all these issues happening today.

What Should Happen?

Claude should be not touching any unrelated code.

Error Messages/Logs

Steps to Reproduce

1. Ask Claude to fix an existing project, and you can see the difference.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.25

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

I suggest, totally remove that useless Opus 4.1 first then fix the Sonnet 4.5