On Monday (October 6th), at the annual DevDay conference in San Francisco, OpenAI CEO Sam Altman announced that ChatGPT has reached 800 million weekly active users, significantly outpacing its peers.

In fact, if you add up the average users of its five major competitors, ChatGPT has roughly double the number.

The chart above shows average monthly active users. For comparison, ChatGPT's 3.2 billion users are calculated by multiplying its weekly user base of 800 million by four.

In comparison, Meta AI, Google's Gemini, xAI's Grok, Perplexity, and Anthropic's Claude have a combined monthly active user base of 1.575 billion, nearly half of ChatGPT's. (Meta AI's data also includes users across all company platforms, not just individual apps.)

In February of this year, ChatGPT's weekly active users just surpassed 400 million, more than doubling in the past eight months.

November 2023: Altman announced at the inaugural DevDay conference that ChatGPT had surpassed 100 million weekly active users.

August 2024: Axios reported that ChatGPT had reached 200 million cumulative weekly active users.

December 2024: At the New York Times DealBook Summit, Altman revealed that ChatGPT had surpassed 300 million weekly active users.

February 2025: The platform reportedly had surpassed 400 million weekly active users.

August 2025: ChatGPT's head said the platform's weekly active users were on track to reach 700 million, up from 500 million at the end of March.

ChatGPT launched in late 2022 and reached 100 million monthly active users in just a few months, making it the fastest-growing app in history, UBS analysts wrote in early 2023.