OpenAI’s ChatGPT has surpassed 5 million paying business users, Chief Operating Officer Brad Lightcap said on Friday, highlighting the accelerating adoption of the company’s flagship conversational-AI product among corporate customers. The milestone marks a 66 percent jump in July from the prior month, according to figures shared internally. OpenAI said the surge was driven by large-scale enterprise rollouts and pilot projects that converted to paid subscriptions. The growth comes as the San Francisco-based company prepares a slate of new offerings, including the long-anticipated GPT-5 model and a lower-priced “Go” subscription tier for casual users, according to industry reports. Enterprise momentum for ChatGPT mirrors a broader boom in generative AI: mobile apps in the category generated an estimated $1.9 billion in in-app purchases during the first half of 2025, data provider Sensor Tower estimates.