The location was apt: The Pioneer Building in the city’s Mission district, a 122-year-old former truck factory, and most recently, headquarters of OpenAI, the juggernaut maker of ChatGPT led by cofounder Sam Altman. xAI had just moved into the building, Musk said, attendees told Forbes.

It was held by Elon Musk at the original Mission District headquarters of OpenAI, which Musk cofounded before leaving after (reportedly) failing to take it over. And Musk was there to convince people to join his latest startup,