OpenAI chief executive Sam Altman said on Friday the generative AI startup had reached about 800 million users. "Something like 10% of the world uses our systems, now a lot," Altman said to host Chris Anderson at the TED 2025 event,

It's been nearly 18 months since Sam Altman was unceremoniously sacked from OpenAI before being summarily reinstated just a few days later — and a new book claims to have the tea behind the stunning coup.