Codex not working on a processor without AVX-512 support

Resolved 💬 1 comment Opened Apr 18, 2026 by rayanovelha Closed Apr 18, 2026

What version of Codex CLI is running?

codex-cli 0.104.0

What subscription do you have?

Plus

Which model were you using?

gpt-5.4

What platform is your computer?

Microsoft Windows NT 10.0.26220.0 x64

What terminal emulator and version are you using (if applicable)?

Windows Terminal (CMD)

What issue are you seeing?

I’m experiencing a compatibility issue with any Codex version above 0.104.0, likely caused by AVX512 incompatibility.
Fatal Error: HW capability found: 0x178BFBFF 0xFED8320B, but HW capability requested: 0x200000 0x00.

I’m concerned because version 0.104 will eventually lose support, and I won’t be able to use codex anymore.

What steps can reproduce the bug?

Use Codex on a processor without AVX-512 support

What is the expected behavior?

_No response_

Additional information

CPU: AMD Ryzen 7 5800X3D 8-Core Processor

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