It seems the Codex version in Xcode is irrelevant. It now works on 0.132.0 I've read on Twitter/X.com that the problem might be in the OpenAI backend, not in Xcode... Don't know for sure. But for now it does work.

This is a terrific report, you wrote it much better than me. Just like to mention: There are lots of threads and FB about this. See https://developer.apple.com/forums/thread/828550 https://developer.apple.com/forums/thread/825837 https://developer.apple.com/forums/thread/831241 There are at least these feedbacks pending: https://feedbackassistant.apple.com/feedback/22732574 https://feedbackassistant.apple.com/feedback/22776692 https://feedbackassistant.apple.com/feedback/22928142 https://feedbackassistant.apple.com/feedback/22988151

This is becoming annoying really quick. OpenAI sometimes has the same issue. On my machine, Claude works but OpenAI does not. See https://developer.apple.com/forums/thread/828550 https://developer.apple.com/forums/thread/825837 There are at least these feedbacks pending: https://feedbackassistant.apple.com/feedback/22732574 https://feedbackassistant.apple.com/feedback/22776692 https://feedbackassistant.apple.com/feedback/22928142 https://feedbackassistant.apple.com/feedback/22988151

This is still broken. Has been at least as of May, 26, when I opened this thread: https://developer.apple.com/forums/thread/825837 There are at least these feedbacks pending: https://feedbackassistant.apple.com/feedback/22732574 https://feedbackassistant.apple.com/feedback/22776692 https://feedbackassistant.apple.com/feedback/22928142 https://feedbackassistant.apple.com/feedback/22988151 This is becoming pretty annoying. @DTS Engineer can you help?

It is definitely broken on 0.132.0

It does not work, again. Filed FB22988151

I have installed the new Xcode 26.5 release version (and I am on macOS 26.5). It works now! Maybe someone can confirm.

I filed Feedback a couple of days ago: FB22732574

Hey Albert, thanks for your competent reply. Yes, Xcode release candidate 26.5 (17F42). I have deleted the cache. I have also deleted codex* and chatgpt* (empty) from the system keychain. No VPN connection. The problem persists. I have now switched Xcode over to use "Authenticate with configuration file". It does that, but I am unsure whether the configuration file works, and I don't really know how to check. The codex* entries in keychain are back since I logged in on the Codex app. Kind regards

I have filed Feedback with Apple FB13769072