Sam altman is almost supine. He is leaning back in his chair, feet up, in his home library overlooking San Francisco’s Golden Gate Bridge. In washed jeans and a t-shirt, the 37-year-old entrepreneur looks about as laid-back as someone with a galloping mind ever could. Yet the ceo of Openai, a startup reportedly valued at nearly $20bn whose mission is to make artificial intelligence a force for good, is not one for light conversation. The only signs of playfulness are two pairs of pink-coloured high-tops sitting on a bookshelf, with logos representing his two favourite technologies, ai and nuclear fusion. Occasionally he drifts into nerd-speak. At one point, keen to convince your correspondent that ai will progress faster than people think, he says, sounding rather robotic himself: “I’m curious if that caused you to update your priors.”

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