[BUG] Crash specific to pre-AVX2 Intel Macs.

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?

Claude Code process exited with code 132 (SIGILL) on every message.

Model: MacBookPro10,2 (Late 2012)
OS: macOS Ventura (via OCLP)
Claude Desktop: 1.6608.1
Error: Claude Code process exited with code 132 (SIGILL) on every message
CPU: No AVX2 support (machdep.cpu.features output)
When it broke: After pasting an image ~May 8 2026, now crashes on all messages

What Should Happen?

It was all working fine on this old Mac, until I pasted an image to Claude Code Desktop.

Now I get an error with code 132 (SIGILL) on every message

Error Messages/Logs

Claude Code process exited with code 132

Steps to Reproduce

Simply try to prompt Claude Desktop Code and I get that error right away.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.128

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_