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claude-code - 💡(How to fix) Fix [BUG] Claude code won't start / Error 3221225501 / "no_avx2 no_avx" / Bun💩.. [1 comments, 2 participants]

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anthropics/claude-code#52439•Fetched 2026-04-24 06:07:14
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Error Message

Error Messages/Logs

Code Example

Bun v1.3.13 (0d189c58) Windows x64 (baseline)
Windows v.win10_cu
Args:
Features: no_avx2 no_avx
Elapsed: 4ms | User: 15ms | Sys: 31ms
RSS:
RAW_BUFFERClick to expand / collapse

Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Please return the version running through node.js (2.1.112 works fine) or fallback to the node.js version if the processor does not support avx

What Should Happen?

Claude code should run through node.js

Error Messages/Logs

Bun v1.3.13 (0d189c58) Windows x64 (baseline)
Windows v.win10_cu
Args:
Features: no_avx2 no_avx
Elapsed: 4ms | User: 15ms | Sys: 31ms
RSS:

Steps to Reproduce

claude error no_avx2 no_avx

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.112

Claude Code Version

2.1.118

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

No response

extent analysis

TL;DR

The issue can likely be resolved by falling back to the node.js version since the processor does not support AVX.

Guidance

  • The error messages indicate that the processor does not support AVX or AVX2, which is required for the current version of Claude Code to run.
  • To verify the issue, check the processor specifications to confirm the lack of AVX support.
  • Consider using a version of Claude Code that falls back to node.js when AVX is not supported, such as version 2.1.112.
  • If possible, update the processor or use a different machine that supports AVX to run the latest version of Claude Code.

Example

No code snippet is provided as it is not clearly supported by the issue.

Notes

The solution may not apply if the processor supports AVX but the error persists, in which case further investigation is needed.

Recommendation

Apply workaround: Use version 2.1.112 of Claude Code, which falls back to node.js when AVX is not supported, as it is known to work in this scenario.

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