According to Sensor Tower estimates cited by Reuters, ChatGPT crossed 1 billion monthly active users in June 2026, just over a year after hitting 400 million weekly users.
In June 2026, ChatGPT surpassed 1 billion monthly active users (MAU) worldwide, according to Sensor Tower estimates cited by Reuters — becoming the fastest app in mobile history to reach the 1-billion-user milestone.
Unprecedented growth
To picture the pace: in February 2025, OpenAI reported ChatGPT had about 400 million weekly active users. By February 2026, that number had more than doubled to about 900 million weekly users. And just a few months later, monthly active users officially hit 1 billion.
Revenue rising in step
Alongside user growth, OpenAI said revenue had passed $25 billion in annualized revenue as of February 2026 — about $2 billion per month — with 50 million paying users. The company is also pushing advertising built into the conversational experience — positioning it as "useful" ads tied to the context of an answer, rather than traditional behavior-based advertising.
What it means for the market
This adoption speed places ChatGPT among the fastest-growing consumer tech products ever recorded, far outpacing previous popular social apps at launch. It also shows conversational AI shifting from a "fun to try" tool to infrastructure used daily by billions — bringing growing pressure on infrastructure costs, data safety and competition from rivals like Gemini and Claude.
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