[BUG] Claude Code doesn't install on Sequoia Mac Pro 2013.

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?

Problem

Installing claude code with curl command on Mac OS results in error message "Illegal instruction" while building.

What Should Happen?

Claude code should install and setup.

Error Messages/Logs

CLI output: 
`curl -fsSL https://claude.ai/install.sh | bash`
`Setting up Claude Code...`
`bash: line 151:  5976 Illegal instruction: 4  "$binary_path" install ${TARGET:+"$TARGET"}`

Homebrew also does not function.

Steps to Reproduce

1. Run curl command on a x86 Mac OS 15.7 machine.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

can't get this

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

uname -m && uname -a
x86_64
Darwin Mac-Pro.local 24.6.0 Darwin Kernel Version 24.6.0: Fri Feb 27 19:33:24 PST 2026; root:xnu-11417.140.69.709.8~1/RELEASE_X86_64 x86_64