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.”

In the latest development in the pair’s longtime feud, Elon Musk, a key White House advisor as well as the founder of AI company xAI, criticized the $500 billion Stargate AI infrastructure plan backed by rival Sam Altman and his company OpenAI.