OpenAI CEO Sam Altman rejected a potentially seismic deal that could shape the future of artificial intelligence, telling the Elon Musk-led group of investors that the ChatGPT maker is not for sale.

The relationship between Sam Altman and Elon Musk goes back to the early days of OpenAI —then a nonprofit research lab. But now the two men find themselves in a very public feud over the billion-dollar AI company. Today on the show, we catalog their friendship turned feud and how the company that started it all still remains core to their beef.

The relationship between Elon Musk and Sam Altman progressed from an initial friendship to a bitter rivalry. Here's why.