Major AI Services Including ChatGPT and Claude Experience Global Outage

A widespread outage on Thursday, September 3, 2026, disrupted access to multiple major artificial intelligence services, including ChatGPT, Claude, Gemini, Copilot, and Grok, affecting thousands of users globally. The incident, which began in the morning, prompted a flurry of error reports and service alerts before being resolved later in the day. According to user reports on DownDetector, issues with ChatGPT began around 11 a.m. ET. The disruption quickly expanded to other platforms, with Anthropic's Claude experiencing significant problems starting at approximately 1:26 p.m. UTC. Anthropic's status page confirmed elevated error rates affecting several of its models, including Mythos 5.1, Fable 5.1, Opus 5, Opus 4.8, and Opus 4.6. Users reported prompts failing, sessions disconnecting, and receiving "at capacity" warnings across web, mobile, and API integrations. The simultaneous nature of the outages across competing AI providers was unusual. While individual services experience brief downtime occasionally, a coordinated failure across the industry is rare. The cause of the widespread disruption was not immediately clear.