codex - 💡(How to fix) Fix Regression: VS Code extension codex.exe requires AVX-512 and crashes on Zen 3 (Ryzen 5000) [1 participants]

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openai/codex#17410Fetched 2026-04-11 06:16:39
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Error Message

Fatal Error: HW capability found: 0x..., but HW capability requested: 0x200000 0x00. 3. Observe immediate startup failure with HW capability requested error.

Root Cause

Codex crashes at startup because the binary requests CPU capabilities not present on Zen 3 CPUs. Fatal Error: HW capability found: 0x..., but HW capability requested: 0x200000 0x00. From behavior and CPU feature mapping, this appears to be an AVX-512 requirement in the shipped [codex.exe].

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What version of the IDE extension are you using?

1.115.0

What subscription do you have?

Plus

Which IDE are you using?

VS Code

What platform is your computer?

Windwos 11

What issue are you seeing?

Codex crashes at startup because the binary requests CPU capabilities not present on Zen 3 CPUs. Fatal Error: HW capability found: 0x..., but HW capability requested: 0x200000 0x00. From behavior and CPU feature mapping, this appears to be an AVX-512 requirement in the shipped [codex.exe].

What steps can reproduce the bug?

  1. Install/update to the affected canary/alpha version of openai.chatgpt.
  2. Open VS Code and start Codex.
  3. Observe immediate startup failure with HW capability requested error.

What is the expected behavior?

Codex should run on CPUs without AVX-512 (or gracefully provide a compatible binary / fallback).

Additional information

Please publish a Windows build compatible with non-AVX-512 CPUs (or document minimum CPU instruction requirements clearly if intentionally changed).

extent analysis

TL;DR

The issue can be resolved by using a version of the Codex binary that does not require AVX-512 CPU capabilities.

Guidance

  • The error message indicates that the Codex binary is requesting AVX-512 capabilities, which are not present on Zen 3 CPUs, causing the crash.
  • To verify the issue, check the CPU capabilities of your system and compare them to the requirements of the Codex binary.
  • A potential workaround is to use a different version of the Codex binary that does not require AVX-512, if available.
  • The user can also consider using a different CPU or a virtual machine that supports AVX-512, although this may not be a practical solution.

Example

No code snippet is provided as this issue appears to be related to binary compatibility rather than code.

Notes

The issue is specific to the combination of the Codex binary, VS Code, and Windows 11 on Zen 3 CPUs, and may not affect other users with different hardware or software configurations.

Recommendation

Apply workaround: The user should wait for a new version of the Codex binary that is compatible with non-AVX-512 CPUs, or consider using a different CPU or virtual machine that supports AVX-512, as the current version is not compatible with their hardware.

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