Elon Musk took the stand as the first witness in a court case, recounting his career from his early days to his roles at PayPal, SpaceX, Tesla, and Neuralink. During his testimony, Musk humorously downplayed his involvement with OpenAI, stating he "came up with the idea, named it, hired the key people, taught them everything I knew, and provided all the startup funding," but added, "Beyond that, I did nothing." The courtroom, however, remained largely silent. Musk also addressed his relationship with former OpenAI board member Shivon Zilis, referring to her as his chief of staff, which led to some confusion among the jury. Zilis is known to be the mother of several of Musk's children. Additionally, Musk mentioned that after recruiting Sutskever from Google, "Larry Page never spoke to me again." The trial saw Altman engaging with a journalist, while Brockman quietly took notes during Musk's testimony.