Almost 500 OpenAI employees have threatened to quit unless the current board members resign and reappoint ex-CEO Sam Altman. In a letter, the employees expressed concern that Altman's firing had jeopardized the company's mission and stated they would leave and join Altman at Microsoft if the board did not step down. The letter also criticized the board's competence and lack of transparency. OpenAI fired Altman in November, citing a loss of confidence in his leadership.