[BUG] Intel(R) Xeon(R) CPU E5-1620 v2 @ 3.70GHz -> Error: Claude Code process terminated by signal SIGILL

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?

"Error: Claude Code process terminated by signal SIGILL"
when trying to use Claude Code on VS Code in an Intel(R) Xeon(R) CPU E5-1620 v2 @ 3.70GHz machine

What Should Happen?

The machine should be capable of using Claude Code as VS Code extension

Error Messages/Logs

Error: Claude Code process terminated by signal SIGILL

Steps to Reproduce

1. Install Claude Code Extension on VS Code in a Mac Pro Intel(R) Xeon(R) CPU E5-1620 v2 @ 3.70GHz
2. Open Claude Code chat on VS Code

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude Code Extension for VS Code

Platform

Other

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

From Claude Sonnet:

The Xeon E5-1620 v2 is a powerful chip but it's from a generation that predates AVX2, and unfortunately more software is starting to require it as a baseline. This is worth flagging to Anthropic since it's not an obvious requirement.