On Thursday local time in the U.S., ChatGPT, Sora, and OpenAI's API services for developers encountered another outage, lasting over four hours. OpenAI reported a significant disruption starting at 11 AM (all times referenced in this article are local to the U.S.), but by 3:16 PM, services were gradually being restored. Regular users of ChatGPT might recall that there was also an outage earlier this month. On its status page, OpenAI indicated that this major disruption was caused by issues with its upstream provider.