ChatGPT, Grok, and Claude all went down at the same time
What changed
ChatGPT, Grok, and Claude experienced service problems at roughly the same time on Thursday, beginning around 11 a.m. Eastern time. ChatGPT users saw error messages, and OpenAI reported increased errors affecting ChatGPT and Codex; all three services later came back online.
What this means for you
People relying on these chatbots temporarily lost access to several major services at once, including ChatGPT’s coding tool. The report does not identify a shared cause, so users should not assume that switching between these services will always avoid an outage.