[BUG] Severe Memory Leak (20GB+)

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?

cli using insane amount of memory

<img width="832" height="57" alt="Image" src="https://github.com/user-attachments/assets/1c278c0a-fde7-443c-bee9-6f7f00ee356b" />

Context Usage
Model: claude-opus-4-5-20251101
Tokens: 74.3k / 200.0k (37%)
Categories
Category Tokens Percentage
System prompt 3.0k 1.5%
System tools 13.5k 6.8%
Messages 12.8k 6.4%
Free space 125.7k 62.8%
Autocompact buffer 45.0k 22.5%

What Should Happen?

cli should not be using 20GB of RAM.

Error Messages/Logs

Steps to Reproduce

Don't know how to reproduce, it randomly happens - cant see any particular thing that causes

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.53

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_