The news: OpenAI’s ChatGPT now serves 400 million weekly users, and over 2 million businesses have integrated it into workflows, doubling enterprise adoption since late 2024.
The AI leader is now preparing to launch its GPT-5 flagship model—which the company says will integrate its o-series advanced reasoning models—as competition emerges from China’s low-cost DeepSeek R-1 and xAI’s Grok 3.
Use cases for ChatGPT's growth: ChatGPT has locked in enterprise users, with API usage up 5x since o3’s launch in January.