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.

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ChatGPT’s enterprise surge: 400 million users, 2 million businesses, and the race to profits

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