Nothing changed on my end, Pro subscription still active, but Xcode 26.5 (17F42) simply does not want to log into Codex anymore. It opens the OAuth flow and after finishing and closing the window, it still says "Not Signed In".
Codex login works everywhere else, including the Codex app.
What to do?
Same here. Broken
I have the same issue. Hadn't used Codex for a while but it worked fine the last time, about 2 weeks ago. No updates I'm aware of. Today it suddenly timed out and I decided to log out. Current version: Codex 0.129.0-alpha.9 | 17F42
I worked around it by logging in with a key and login is (or seems) successful. However, it's not possible to send any request. It either says: could not open JSON stream or "usage / quota limit exceeded" (I haven't even used it).
Thanks guys for reporting this, definitely it seems something on the backend of the third party, however, I think will be important to file a bug so we can get a resolution of the issue.
Once you open the bug report, please post the FB number here for my reference.
If you have any questions about filing a bug report, take a look at Bug Reporting: How and Why?
Albert Worldwide Developer Relations.
Bug report FB22920242
Things are seriously out of whack. I can sign in to OpenAi chat, but not to the agent.
@Michaf Thanks so much for the bug number, routing it right now to the correct team so they can get to the bottom of the issue.
You can see the status of your feedback in Feedback Assistant. There, you can track if the report is still being investigated, has a potential identifiable fix, or has been resolved in another way. The status appears beside the label "Resolution." We're unable to share any updates on specific reports on the forums.
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Albert Worldwide Developer Relations.
This may be relevant: OpenAI removed GPT-5.3 Codex from the ChatGPT plans in June. The model is now only available via the API – but it appears to be the ‘default’ model in the Codex settings for the XCode Agents. With other models such as GPT-5.4, GPT-5.4-Mini and GPT-5.5 (depending on what’s available in your GPT account), agent mode should work in a new Codex session.
BTW: Is it just me, or is there no UI to set the reasoning level for the agents?
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