Attorney Steven Molo, representing Elon Musk, arrives at the federal courthouse during proceedings in the trial over Elon Musk's lawsuit against OpenAI in Oakland, California, on May 12, 2026. OpenAI CEO Sam Altman is expected to take the stand Tuesday in the blockbuster civil trial in California triggered by a lawsuit from the world's richest man Elon Musk against the AI behemoth. Musk, the founder of Tesla and SpaceX, alleges that Altman and co-founder Greg Brockman misappropriated his $38 million donations when OpenAI abandoned its original nonprofit and philanthropic mission to become the for-profit giant behind ChatGPT. (Photo by JOSH EDELSON / AFP via Getty Images)