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
This issue has 1 comment on GitHub. Read the full discussion on GitHub ↗