The Endeavor CEO was enlisted to join investors who put in an unsolicited offer to buy OpenAI's majority share of its for-profit arm.

The two tech titans are in the meanest fight in business. The stakes couldn’t be higher.

OpenAI chief executive Sam Altman responded to Elon Musk’s offer to buy the AI startup this week by saying it’s not for sale.

Elon Musk is leading a consortium that wants to buy OpenAI and return it to its original mission. Is he serious? And what ...