This week, Elon Musk brought a new chatbot into the crowded A.I. universe — Grok 3, the latest model from his company xAI. We break down how it compares with other leading models and what it reveals about Musk’s larger ambitions. Then, Vlad Tenev, the chief executive of the investing platform Robinhood, lays out his vision for the future of investing and fields some difficult questions about his company’s role in fueling a culture of risky financial speculation. Finally, Kevin revisits his high school coding era and tries to make Casey a new software tool, with an A.I. assist.

Guest:

• Vlad Tenev, chief executive of Robinhood and co-founder of Harmonic.

Additional Reading:

• There Are Probably Too Many A.I. Companies Now
• An Investing Revolution Is Coming. The U.S. Isn’t Ready for It.
• Is Math the Path to Chatbots That Don’t Make Stuff Up?

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