I spent yesterday mingling with a couple hundred leaders from the AI industry in the San Francisco neighborhood of Hayes Valley, which has recently been dubbed “Cerebral Valley” due to its concentration of AI startups and hacker houses.

The appropriately named Cerebral Valley AI Summit was thrown by my friend Eric Newcomer, who has an excellent Substack about the VC industry you should subscribe to if you haven’t already. Speakers included Stability AI CEO Emad Mostaque, Quora CEO and OpenAI board member Adam D’Angelo, Databricks CEO Ali Ghodsi, and Hugging Face CEO Clement Delangue.

Below, I have notes from the day’s onstage talks and hallway chatter, including fears about AI killing us all, how people really feel about Elon Musk’s open letter, why open-source AI is having a moment, and more.