OpenAI experienced a nearly four-hour outage on September 3, affecting 19 distinct components across its ChatGPT and Codex platforms. The disruption began around 10:58 AM ET and ended at 2:56 PM ET, impacting conversations, image generation, code tools, and user login functionality. The company confirmed the issue was resolved, with uptime figures of 99.63% for ChatGPT and 100% for Codex over the recent period. This incident adds to a growing list of service disruptions in 2026, including elevated error rates on ChatGPT Work Mode the same day and GPT-5.5 errors in Codex on June 11.
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