[BUG] Claude Code v2.1.113+ fails on Intel Mac with 'Illegal instruction: 4'

Bug Description

Starting from v2.1.113, Claude Code crashes on Intel Mac with "Illegal instruction: 4" error, likely due to AVX2 requirement.

System Info

• macOS on Intel Quad-Core i7 (x86_64)
• Node.js v22.21.0
• npm 10.9.4

Testing Results

| Version | Status |
|---------|--------|
| v2.0.76 | ✅ Works |
| v2.1.112 | ✅ Works (last compatible) |
| v2.1.113 | ❌ Illegal instruction: 4 |
| v2.1.143 (latest) | ❌ Fails |

Expected Behavior

Claude Code should work on Intel Macs, or provide a compatible build.

Suggested Fix

Compile without AVX2 requirement: RUSTFLAGS="-C target-cpu=x86-64"

Related Issues

• #5864 (closed, not planned)
• #20435

Many developers still use Intel Macs. Being stuck on v2.1.112 means missing future updates and potentially new model support.