What really broke ChatGPT on March 20
OpenAI just published a technical post-mortem detailing the March 20 ChatGPT outage. A bug in the open-source redis-py library corrupted cache connections, accidentally exposing chat titles and payment info—including names, emails, and credit card last four digits—for about 1.2% of active Plus subscribers. OpenAI has patched the issue alongside Redis maintainers and restored service.