The tech billionaires have a rocky history, and Musk's comments about funding for the project, which could attract $500 billion prompted a pointed response from OpenAI leader Altman.

A version of this article originally appeared in Quartz’s Need to Know: Davos newsletter. To get updates on the World Economic Forum delivered straight to your inbox all week, sign up here.

Davos newsletter! President Donald Trump’s virtual visit to Davos today laid out his vision for Trump 2.0. Here are some highlights: AI Infrastructure investment: Trump touted the $500B “Stargate” ...