ChatGPT change history: Issues with logins and signups

A major outage affected logins and account creation for ChatGPT and the API Platform, plus API Platform organization management and dashboard access; users already signed in may still have been able to use ChatGPT. It started at 2026-07-21 18:36 UTC and was resolved at 2026-07-21 19:00 UTC (23 min), with all affected API Platform functionality fully recovered.