Sam Altman ousted from OpenAI following board review citing lack of candor. Board lost confidence, resulting in Altman's termination as CEO and board member. Greg Brockman steps down as chairman, remaining president, with Mira Murati promoted to interim CEO, former OpenAI's CTO. OpenAI initiates search for permanent CEO. Altman's relationship with board structures and potential capital raising activities may be implicated. Tech giant Microsoft, having invested $13 billion and holding a 49% stake in OpenAI, informed minutes before news publicized.
