[BUG] Compacting conversation started at only 16% of context used.

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="600" height="153" alt="Image" src="https://github.com/user-attachments/assets/8fffa7aa-c71f-4e3c-8632-5d9c7d765a04" />

What Should Happen?

Claude compacted conversation while only 16% of context was used. Seems like it did not know that it now has 1M context window

Error Messages/Logs

Steps to Reproduce

no idea

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.75

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_