Mr. Altman, the C.E.O. of OpenAI, said on Tuesday that he worried Elon Musk wanted control of the A.I. lab.

Musk’s reply was a “hair-raising moment” in the early days of OpenAI, CEO Sam Altman said in testimony on Tuesday, in a trial that could determine the future of his company and potentially the AI indu...

Elon Musk's lawsuit against one of the world's most valuable private companies has provided a number of details about the inner workings of OpenAI.