OAKLAND, Calif. — OpenAI co-founder and President Greg Brockman disclosed in a trial Monday that his stake in the firm is worth nearly $30 billion, confirming a figure that co-founder Elon Musk has pointed to in arguing that OpenAI has abandoned its mission as a nonprofit organization. Brockman took the stand during the fourth day of the trial. Musk is suing Brockman and OpenAI CEO Sam Altman, alleging that they unlawfully converted a charity that he helped start into a for-profit business, best known for creating the popular artificial intelligence app ChatGPT. Brockman was repeatedly asked to reconcile his nearly $30 billion stake with OpenAI’s stated mission of making AI technology to benefit all of humanity. He testified that the mission hasn’t changed, even after its board has sold equity stakes to outside investors. “You just happen to be $30 billion richer?” Musk lawyer Steven Molo asked. “Compensation was certainly secondary to the mission,” Brockman responded.…