Magnitude

Users · 12 Aug 2026 · Mixed confidence

Both hit a billion. They are not counting the same thing.

ChatGPT’s 1 billion is Sensor Tower monthly app users. Gemini’s 1 billion is Google’s own app MAU. OpenAI’s last official weekly figure is still 900 million.

Download PNG/c/billion-race
Both hit a billion. They are not counting the same thing.

How to read this

Plotted as separate series, not a like-for-like race. Gemini includes Android default distribution. ChatGPT 1B MAU is third-party. OpenAI has never published MAU.

Sources

Sensor Tower / Reuters · Google blog 11 Aug 2026 · OpenAI

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