[BUG] Claude Code Desktop lost its 1m context for Opus 4.6, while CLI maintains it

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?

• Max plan
• CLI still shows 1M Opus, Desktop does not
• Verified with /context on both CLI/desktop app, and they do actually differ
• Desktop had it 2 days ago, lost it after today's update
• Desktop version number below (Windows version)

<img width="303" height="391" alt="Image" src="https://github.com/user-attachments/assets/cf09b011-2915-412c-bb49-a24ceb5c9f5f" />

What Should Happen?

1m context should be available on Claude Desktop for Windows, on the latest version

Error Messages/Logs

Steps to Reproduce

1. Launch latest Windows desktop app for Claude Code
2. Select Opus 4.6 (only option available)
3. /context to check context, 200k is max
4. CLI works as intended with the full 1m context window

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Every previous version since it was introduced

Claude Code Version

Version 1.1.7714 (3bd6f6)

Platform

Other

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_