Environment:
- macOS: Tahoe 26.4
- Xcode: 26.5
- ChatGPT account successfully authenticated
- Codex CLI installed and working
- Codex App installed and working
Steps to reproduce:
- Install Xcode Codex/OpenAI component version where GPT-5.4 is the highest available model.
- Sign in with ChatGPT account.
- Confirm Codex works in Xcode.
- Update the OpenAI/Codex component in Xcode.
- Attempt to sign in again.
Expected result:
- Xcode completes authentication and shows signed-in status.
Actual result:
- Browser successfully completes authentication and displays "Signed in to Codex."
- Xcode remains in a sign-in loop or shows "Not Signed In."
- Authentication never completes.
Additional observations:
- Codex CLI authentication succeeds.
- Codex App authentication succeeds.
- ChatGPT web/app access succeeds.
- Anthropic/Claude component updates continue to work normally in Xcode.
- Issue appears specific to the updated OpenAI/Codex Xcode component.
- Older component (GPT-5.4 maximum model available) authenticates successfully.
