Sam Altman takes the stand to testify in Musk suit: Live updates CNBCOpenAI chief Altman to take stand in Elon Musk trial ReutersIn a trial pitting him against Elon Musk, nobody has more to lose than OpenAI CEO Sam Altman AP NewsMicrosoft's C.E.O. Intervened When OpenAI Fired Sam Altman, Musk's Lawyer Claims The New York Times