OpenAI confirmed earlier today that the outage suffered by ChatGPT and its API on Wednesday was caused by a distributed denial-of-service (DDoS) attack.

“We are dealing with periodic outages due to an abnormal traffic pattern reflective of a DDoS attack. We are continuing work to mitigate this.” reads the update posted by OpenAI on its status page 17 hours ago.

The organization first reported partial service outages on November 7, but on November 8 the services were disrupted.