watch now Elon Musk was scheduled to join CNBC on Friday for a live interview with Julia Boorstin, but he postponed just before it was set to begin. Musk was expected to discuss Tesla, the historic SpaceX initial public offering and the launch of the company's latest Grok artificial intelligence model. The AI arm of Musk's empire, SpaceXAI, unveiled its latest model, Grok 4.5, on Wednesday, joining a wave of recent product releases from competing labs.