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codex - 💡(How to fix) Fix Codex Desktop crashes on startup with exit code 3221225501 (0xC000001D) on Windows 11 25H2

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Error Message

Codex Desktop app crashes immediately on startup with the following error: Most recent error: Codex app-server websocket closed (code=3221225501) 3. App immediately shows the error screen with code 3221225501

  • Installed Git for Windows (resolved an initial "git not found" error, but this crash persists)
RAW_BUFFERClick to expand / collapse

What version of the Codex App are you using (From “About Codex” dialog)?

Unable to check — app crashes on startup

What subscription do you have?

Free

What platform is your computer?

Windows 11 25H2 (Build 26200.8457) x64

What issue are you seeing?

Codex Desktop app crashes immediately on startup with the following error:

(code=3221225501, signal=null). Most recent error: Codex app-server websocket closed (code=3221225501)

Exit code 3221225501 corresponds to 0xC000001D (STATUS_ILLEGAL_INSTRUCTION), indicating the bundled binary is executing an unsupported CPU instruction.

What steps can reproduce the bug?

  1. Download and install Codex Desktop from the official website (installed as a Windows app via MSIX/Store package)
  2. Launch Codex
  3. App immediately shows the error screen with code 3221225501

No further interaction is possible — the app never reaches the main UI.

What is the expected behavior?

Codex Desktop should launch normally and display the main interface without crashing.

Additional information

  • CPU: AMD Ryzen AI MAX+ 395 w/ Radeon 8060S (Zen 5, 16 cores / 32 threads)
  • RAM: 124 GB
  • GPU: AMD Radeon 8060S
  • Git: Git for Windows 2.54.0 (freshly installed)

What I've tried:

  • Installed Git for Windows (resolved an initial "git not found" error, but this crash persists)
  • Tried with VPN on/off (Astrill VPN, tested OpenWeb and StealthVPN protocols)
  • Clicked "Update Codex" and "Reload" buttons — no change
  • Rebooted the system — no change

This appears to be the same class of issue as #57698 in anthropics/claude-code, where the bundled Bun binary crashes with 0xC000001D on certain systems.

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codex - 💡(How to fix) Fix Codex Desktop crashes on startup with exit code 3221225501 (0xC000001D) on Windows 11 25H2