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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 model , which is designed to enhance logical inference and structured problem-solving capabilities. 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 AI is reshaping the workplace: 2 million businesses now rely on ChatGPT
The surge in enterprise adoption represents a crucial validation of OpenAI’s strategy to position ChatGPT as not just a chatbot for casual queries, but as a serious productivity tool for businesses. Companies such as Morgan Stanley , Uber and T-Mobile have integrated OpenAI’s models into their workflows, using AI to generate reports, automate customer service and streamline decision-making.
Notably, OpenAI’s progress comes amid heightened scrutiny over the role of generative AI in business-critical applications. The company recently secured its first federal agency customer, USAID , which is deploying ChatGPT Enterprise to reduce administrative burdens and streamline partnerships, according to FedScoop . The expansion into government contracts suggests OpenAI […]
OpenAI’s ChatGPT explodes to 400M weekly users, with GPT-5 on the way
