Elon Musk’s lawsuit over OpenAI’s shift to a for-profit model kicks off in Oakland, with Musk, Sam Altman and Microsoft’s Satya Nadella set to testify. The case highlights internal clashes as OpenAI faces fierce AI competition and gears up for a potential $1 trillion IPO.

Elon Musk is suing Sam Altman’s OpenAI for billions in damages, claiming breaches stemming from their 2015 co-founding agreement. The jury trial, starting Monday, could reshape the competitive dynamics in the A.I. industry.

A jury in Oakland will soon decide whether OpenAI’s switch from a nonprofit to a for-profit under Sam Altman was fraudulent, a ruling that could unravel the legal basis of the entire AI sector. Elon Musk demands OpenAI revert to nonprofit status and directs any damages to charity, while OpenAI fires back with regulatory complaints and PR campaigns. A verdict for Musk could tank OpenAI’s $850 billion IPO and expose other AI firms to donor and shareholder clawbacks.