OpenAI President Greg Brockman's testimony dominated the fifth day of the trial for Elon Musk's lawsuit against the artificial intelligence company. Benjamin Fanjoy/Getty Images Elon Musk is suing Sam Altman and Greg Brockman over his charitable donations to OpenAI. Brockman, an OpenAI executive and cofounder, took the witness stand on Monday. He was asked about his wealth and OpenAI's IPO plans. The trial for Elon Musk's lawsuit against Sam Altman started up again after a weekend break. On Mo