Elon Musk's courtroom showdown with Sam Altman got underway here Monday with the selection of jurors entrusted to decide whether the co-founders of OpenAI betrayed a mission to build artificial intelligence for the good of humanity, not for money.

The legal clash in a courtroom across the bay from San Francisco pits Musk, the world's richest person, against a startup he once backed and now competes with in the booming AI sector.