ChatGPT, Claude, and Grok experience simultaneous outage
ChatGPT, Claude, and Grok all became inaccessible to users simultaneously on September 3, 2026, in what appears to be a widespread infrastructure incident affecting all three major AI platforms at the same time.
What happened
ChatGPT of OpenAI, Claude of Anthropic and Grok of X all experienced simultaneous service disruptions on the evening of September 3, 2026 (Vietnam time). Error reports on DownDetector increased sharply during the same period, and the three platforms became inaccessible to users.
Reported impact
The outage affected the three leading AI platforms globally. Cursor, an AI programming assistant, also confirmed service interruption as a consequence of disruptions from Grok and Claude. Gemini of Google was reportedly not affected at the same time.
Index analysis
The simultaneous outage of all three major AI platforms at the same time was described as very unusual, even though individual AI service outages are not uncommon. OpenAI's status page indicated the incident lasted approximately 37 minutes and affected ChatGPT and Codex.
Classification
Sources and evidence
This record was researched and written by the Index, based on the following original reporting.