[BUG] Opus 4.6 Autocompacts so often it's making claude code unusable

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?

Since Wednesday, my CC has been autocompacting like crazy, to the point where it can't even make a single plan without compacting. Like, I say "do X" in plan mode, and it's compacting before it can even make a plan. It's creating nightmares where the plans are slop since it doesn't have enough context. I am hitting auto-compact after 2.5 min of usage on a clean CC instance.

What Should Happen?

Don't autocomact so often. When Opus 4.6 first came out, I was NOT having these issues. I first experienced this auto-compact issue on Wednesday (Feb 11).

Error Messages/Logs

n/a

Steps to Reproduce

1. Open claude code
2. Set to plan mode
3. Ask it to generate a plan for anything:

• Implement a new feature
• Design a system to handle X
• Investigate why I have this bug

1. Wait for claude code to auto-compact before the plan is even made

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.39 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

Terminal/Shell: Is ghostty