OpenAI CEO Sam Altman has begun his testimony against Elon Musk in a high-profile jury trial in a California federal courtroom. Altman, alongside OpenAI president Greg Brockman, is a primary defendant in the trial brought by Musk. Altman, Brockman, and Musk were all part of the initial founding team at OpenAI, with Musk investing up to $38 million in the ChatGPT-maker's early days. But the relationship between Musk and other OpenAI founders eventually soured, and Musk stepped away from the compa