ChatGPT, Claude, and Grok Down Simultaneously, Cause Unknown

Three public AI services — ChatGPT, Claude, and Grok — are experiencing simultaneous outages. The publishers mention degraded performance, an infrastructure issue at Anthropic, and overloaded services at xAI, without specifying the cause or recovery timeline.

Unidentified Cause and Limited Commitment on Timelines

The exact cause of the outages remains undetermined, and it is not established that they are related. CJ Avilla, a technical staff member at Anthropic, indicated on X that an infrastructure problem caused a partial outage of its services and that no timeline estimate was available. On the xAI side, a notice on the Grok site specifies that the team is working to restore the service as quickly as possible.

Affected Services at OpenAI, Anthropic, and xAI

At OpenAI, the outage is not limited to conversations with ChatGPT: it also affects connections, file uploads, voice mode usage, search, advanced search, and image creation. OpenAI states that it has deployed a mitigation measure and is monitoring the recovery, while mentioning that the performance of its AI tools remains degraded. Grok, the chatbot from xAI, is unavailable on Android, iOS, and the web. When attempting to use it on X, a message indicates that the model is overloaded and invites users to try again or choose another model. At Anthropic, the status page initially reported that Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, and Opus 4.6 were affected starting at 10:30 AM (Eastern Time), before narrowing the impact to Opus 4.8 and Opus 5. Users also encountered difficulties with the Claude chatbot, Claude Code, and the Claude API during the same timeframe.

Timeline and Context of the Incident

Around 11 AM (Eastern Time), ChatGPT began returning error messages, while OpenAI's status page reported high errors on ChatGPT and Codex. At Anthropic, the first affected models were reported starting at 10:30 AM. Thus, the three services — ChatGPT, Grok, and Claude — were impacted within the same timeframe. This outage occurs as OpenAI builds anticipation around the launch of Astra, its new AI model.