Sam Altman once called Elon Musk, one of his OpenAI co-founders, his hero. Now Musk is suing Altman, accusing him of abandoning OpenAI’s founding mission in pursuit of profit, which OpenAI denies. WSJ’s Berber Jin reports on the highs and lows of a Silicon Valley’s bromance.  Further Reading: - How the Bromance Between Elon Musk and Sam Altman Turned Toxic  - Elon Musk Sues OpenAI, Sam Altman, Saying They Abandoned Founding Mission  Further Listening: - Artificial: The OpenAI Story  - Money, Drugs, Elon Musk and Tesla’s Board  Learn more about your ad choices. Visit megaphone.fm/adchoices