Users · 12 Aug 2026 · High confidence
900 million people use ChatGPT every week
OpenAI’s official weekly-active series runs from 100 million at DevDay 2023 to 900 million-plus in February 2026. It has not published a 1 billion WAU figure.
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How to read this
The May 2026 “1 billion” print is Sensor Tower app MAU — monthly, third-party, apps only. Last official OpenAI WAU: 900M+ (27 Feb 2026, Scaling AI for everyone). Do not mix the two meters.
Sources
OpenAI DevDay · OpenAI blogs · Reuters · CNBC · Axios