OpenAI CEO Sam Altman announced during the company’s Dev Day keynote that ChatGPT has reached 800 million weekly active users, continuing its explosive growth across consumers, developers, and enterprises.
“Today, 4 million developers have built with OpenAI,” Altman said. “More than 800 million people use ChatGPT every week, and we process over 6 billion tokens per minute on the API. Thanks to all of you, AI has gone from something people play with to something people build with every day.”
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The milestone follows a summer of acceleration, from 500 million weekly users in March to 700 million in August, and underscores OpenAI’s dominance as both a consumer product and developer platform. The company also revealed new tools for building apps and agentic systems directly inside ChatGPT, enabling more interactive, adaptive, and personalized AI experiences.
Beyond usage, OpenAI has hit a new financial high. A recent private stock sale valued the company at $500 billion, making it the most valuable privately held company in the world. The news comes on the heels of several major launches, including an updated version of its video-generation tool Sora (now paired with a social platform) and a new agentic commerce partnership with Stripe.
Despite occasional controversy, from “AI hallucinations” to philosophical debates about “sycophantic” behavior, ChatGPT remains the face of generative AI’s mainstream adoption. Just two years after its debut, it has evolved from a viral novelty into a foundational layer of the digital economy.