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ChatGPT reaches 1 billion weekly users as OpenAI eyes IPO
OpenAI crossed the milestone about seven months behind its internal target, but the numbers still put it in rarefied company alongside the world's largest tech platforms.
OpenAI’s suite of products, led by ChatGPT, has officially crossed 1 billion weekly active users. The company confirmed the figure on September 8, 2026, based on a data snapshot from mid-August. To put that in perspective, only a handful of products in history have ever commanded that kind of recurring engagement: think Google Search, YouTube, WhatsApp, and Instagram.
The growth curve is impressive, but it’s bending
OpenAI reported 400 million weekly users back in February 2025. By late 2025, that figure had roughly doubled to around 800 million. By February 2026, it climbed to 900 million. And now, mid-August 2026, it sits north of a billion.
OpenAI had originally set an internal target of reaching 1 billion weekly users by the end of 2025. It missed that mark by about seven months.
On the mobile side, the ChatGPT app hit 1 billion monthly active users by May 2026, a milestone that earned it the title of fastest app ever to reach that benchmark, according to independent tracking from Sensor Tower. For context, TikTok, the previous speed record holder, took roughly four years after its global launch to reach the same number.
The competitive landscape is getting crowded
OpenAI isn’t operating in a vacuum anymore. Google’s Gemini surpassed 1 billion monthly users by August 2026, making it Google’s fastest-growing product ever. Google had previously reported over 950 million monthly active users for Gemini before crossing the billion mark.
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Anthropic’s Claude is also gaining market presence, though the company hasn’t disclosed comparable user figures.
OpenAI now serves 2.5 million businesses alongside its massive consumer base.
An IPO looms in the background
OpenAI has filed confidentially for a potential initial public offering. The enterprise business, with 2.5 million companies on board, is likely the most credible revenue engine. Businesses pay for API access, premium features, and custom deployments. Consumer subscriptions add another layer. But the free tier, which drives the headline user numbers, generates engagement without directly generating much revenue.