OpenAI CEO Sam Altman walks past the fourth floor window at the Ronald V. Dellums US Courthouse in Oakland, California on April 28, 2026. Opening remarks are set for April 28 in a courtroom showdown between billionaire Elon Musk and OpenAI over whether the artificial intelligence company betrayed its non-profit mission. The legal clash across the bay from San Francisco pits the world's richest person against a startup Musk once backed and now competes with in the booming AI sector. (Photo by Karl Mondon / AFP via Getty Images)