401 Unauthorized across Codex Desktop and CLI after working normally all day #48235

Summary

Codex Desktop and Codex CLI both began failing suddenly with 401 Unauthorized after working normally all day. Re-authenticating in both clients does not resolve the issue.

Environment

• Codex CLI: 0.155.1
• Login status: Logged in using ChatGPT
• Remote Linux server for CLI
• ChatGPT desktop app also affected
• User had been actively authenticated and using Codex successfully before the failure began

Desktop error

unexpected status 401 Unauthorized: Incorrect API key provided: sk-svcac[REDACTED].
url: https://chatgpt.com/backend-api/codex/responses

The error included a Cloudflare ray ID and request ID, but the credential itself is intentionally redacted here.

What has been tried

1. Verified CLI version
2. Confirmed codex login status reports Logged in using ChatGPT
3. Logged out and back in on Codex CLI
4. Logged out and back in on the desktop app
5. Same 401 persists in both environments

Why this looks server-side/account-routing related

• Both Desktop and CLI started failing at roughly the same time
• Both had been working normally earlier the same day
• Fresh ChatGPT authentication does not resolve the failure
• The failing endpoint is the ChatGPT Codex backend: /backend-api/codex/responses

Please investigate whether there is an auth-routing/session issue affecting ChatGPT-authenticated Codex traffic even though the public status page currently shows green.