Elon Musk asked a judge to block OpenAI's attempt to transition from nonprofit to for-profit. It's not the first time he's feuded with CEO Sam Altman.

OpenAI’s CEO has stolen Musk’s thunder and it’s a lesson for every leader. Sam Altman and Elon Musk aren’t friends. They used to be colleagues back when the two were co-founders of OpenAI, and they seemingly shared the belief that artificial intelligence could be a huge net benefit for society.

Altman and Musk were OpenAI’s founding co-chairs in 2015, but their relationship has devolved into name-calling and lawsuits.