<ul><li>OpenAI’s ChatGPT has doubled its weekly active users in less than six months, reaching 400 million in February 2025.</li><li>The growth initially plateaued but surged after new features were introduced, including GPT-4o’s multimodal capabilities, Advanced Voice Mode, and the o1 model series.</li><li>ChatGPT's mobile usage has also steadily increased, with 175 million weekly active users accessing it on mobile.</li><li>While competition is intensifying, ChatGPT remains ahead, and niche AI tools in industries like photo editing and language learning generate higher revenue per user.</li></ul>

ChatGPT Hits 400 Million Weekly Users as AI Adoption Increases, a16z Reports

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