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.

Elon Musk “very much” overstepped his bounds when he criticized a $500 billion artificial intelligence project touted by President Donald Trump, according to a White House official as aides are reportedly “furious” with the tech mogul while allies lament that he “abused the proximity to the president.”