Greg Brockman in court with Sam Altman (R) last week Bloomberg/Bloomberg via Getty Images OpenAI's compute costs have surged to $50 billion in 2026 from $30 million in 2017, Brockman said. Brockman said Musk sought a big win for OpenAI before considering any for-profit ventures. Musk demanded 51% of OpenAI but faced resistance from founders, leading to heated confrontations. Greg Brockman 's second day of testimony revealed many insights into Elon Musk 's interactions with OpenAI's founders. Brockman, OpenAI's president, returned to the witness stand on Tuesday, seeking to add "context" to journal entries about how it would be "morally bankrupt" to "steal" the OpenAI nonprofit from Musk. Musk is seeking more than $100 billion in damages from OpenAI in the high-stakes trial , where he said the company deceived him and that its founders, including Brockman, unjustly enriched themselves. Here are the key revelations from Brockman's latest testimony.…