ChatGPT Tops 400 Million Weekly Active Users

OpenAI crossed a significant threshold, with its ChatGPT AI model used by 400 million weekly active users (WAU), or roughly 5% of the global population.

ChatGPT remains the most popular AI model and has the distinction of being the breakthrough product that sparked the AI revolution. In a post on X, COO Brad Lightcap highlighted the company’s latest milestone.

chatgpt recently crossed 400M WAU, we feel very fortunate to serve 5% of the world every week

2M+ business users now use chatgpt at work, and reasoning model API use is up 5x since o3 mini launch

we'll bring GPT-4.5 and GPT-5 to chat and the API soon, with unlimited GPT-5 for… https://t.co/7hfyUcIyBW

— Brad Lightcap (@bradlightcap) February 20, 2025

OpenAI has been trying to continue building on its momentum, not an easy task given how many competitors the company is facing. Anthropic, Google, DeepSeek, and more have increasingly caught up with OpenAI’s models, offering similar performance as ChatGPT, or even surpassing it.

Nonetheless, as Lightcap’s post shows, OpenAI has one major advantage on its side: brand recognition. Because it was the first to make AI widely available, OpenAI enjoys brand recognition that other companies are still trying to achieve. In turn, that brand recognition puts the company in a position to monetize its AI models more than newcomers to the field.

It remains to be seen if OpenAI will remain the leading AI firm, but it certainly has a lot going for it—despite recent challenges.

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