OpenAI’s ChatGPT explodes to 400M weekly users, with GPT-5 on the way

Join our daily and weekly newsletters for the latest updates and exclusive content on industry-leading AI coverage. Learn More OpenAI’s ChatGPT has surpassed 400 million weekly active users, a milestone that underscores the company’s growing reach across both consumer and enterprise markets, according to an X post from chief operating officer Brad Lightcap on Thursday. The rapid expansion comes as OpenAI faces intensifying competition from rivals such as Elon Musk’s xAI and China’s DeepSeek, both of which have recently launched high-performing models aimed at disrupting OpenAI’s dominance. Despite this, OpenAI has seen significant traction in the business sector, with more than two million enterprise users now using ChatGPT at work — doubling from September 2024. “ChatGPT recently crossed 400M WAU, we feel very fortunate to serve 5% of the world every week,” Lightcap wrote. He also noted that usage of OpenAI’s reasoning model API has surged fivefold since the launch of its o3 Mini m ... Read full article.