Sam Altman and Greg Brockman in court Manuel Orbegozo/REUTERS OpenAI quietly changed its bylaws last year, said Elon Musk's expert witness in new court documents. Under the new rules, CEO Sam Altman would only need one-third of the board's support to remain CEO. OpenAI's "supermajority" rules contrast with the trend of most large US public companies. How many board directors does it take to fire OpenAI's Sam Altman ? More than was required in 2023, Elon Musk's expert witness writes in new court documents. During OpenAI's 2025 for-profit transition, it changed its governance structure to make it harder to fire the CEO, according to the documents released by the executive's lawyers on Sunday. Bylaws adopted by OpenAI in October 2025 allow the CEO to remain at the helm so long as he or she has at least one-third support from the for-profit entity's board, according to an analysis of the bylaws by Musk's expert witness conducted in November 2025, the documents said.…