Sam Altman returns as OpenAI CEO under a new initial board led by Bret Taylor, with Larry Summers and Adam D'Angelo also joining, ending the power struggle that followed the board's refusal to explain his 17 November firing. The Associated Press reports that Microsoft's bid to hire Altman and Greg Brockman, and a threatened exodus of nearly all 770 employees, forced the reversal, though the board's new structure remains unclear.