OpenAI, the developer behind the popular AI chatbot ChatGPT, has revealed that it now has 400 million weekly active users. This represents a significant increase from the 300 million users reported in December 2024. The company's rapid growth is a testament to the increasing adoption of AI technology. In addition to its consumer-facing products, OpenAI's enterprise plans are also growing, with 2 million paying enterprise users. The company's developer APIs have seen a doubling of traffic over the past six months. OpenAI's success comes as the company faces competition from rival AI models, including China's DeepSeek. Despite this, OpenAI remains a leader in the field, with its ChatGPT chatbot continuing to attract new users.