4th September 2026 – ( San Francisco) Three of the most widely used AI chatbots — OpenAI’s ChatGPT, xAI’s Grok and Anthropic’s Claude — were unavailable for many users on Thursday after issues began around late morning in the United States, with all three services later restored. OpenAI’s status page reported “elevated errors across ChatGPT and Codex,” while third‑party outage trackers showed spikes in user reports through the morning and midday. By the afternoon, providers indicated recovery and normal operations resuming.
OpenAI’s incident affected core chatbot usage as well as related capabilities, with updates noting mitigation steps and subsequent monitoring as performance returned to baseline. Anthropic cited an infrastructure issue that caused a partial outage across Claude’s web app, code tools and API, before confirming the service was fully back up. Reports also indicated Grok experienced interruptions across platforms, with status posts pointing to broad service degradation before recovery.
While the simultaneity of the disruptions prompted speculation about a common cause, companies did not immediately provide detailed explanations beyond acknowledging service incidents and tracking resolution on their status channels. Coverage across multiple outlets and status monitors showed error reports subsiding by early afternoon, with normal access largely restored for users.