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.

According to Politico, White House staffers think Musk overstepped by publicly accusing OpenAI of not having the money needed to hold up its end of the bargain for a $100 billion investment in the Stargate initiative.