13 Startup Ideas That Could Make You Millions

Y Combinator just dropped their Fall 2026 Request for Startups. And the theme is clear: AI is moving into the physical world. We're excited about a new wave of startups rebuilding the systems that power the real world, from education and healthcare to defense, finance, infrastructure, and work itself. These will come from YC partners building on the frontier, for the first time, one from the sitting US Secretary of the Army. Here are all 13 in 60 seconds! Number one, The Primer. This is an AI tutor that teaches kids to read, write, and reason like a devoted private tutor. Number two, The Future of American Defense. This one was literally pitched by the Secretary of the Army himself. Low-cost interceptors, drones, sensors for the Army. The door is wide open, so let's get to work. Number three, A Cloud for Small Software. This is building an easy way to build, share, custom AI apps. Number four, Multiplayer AI. This is building a way for an entire team to use agents all together. Number five, Compute at Sea. Floating data centers on the ocean. We want to fund founders who are bringing the world's compute to the oceans. Number six, AI-Powered Consumer Products for 1 Billion People. This is a bet on those of you who are building in consumer. Number seven, AI for the Aging Population. One in five people will be older than 65 by 2030. This is building technology for older people. Number eight, New Operating Systems for the Physical World. This is building software that manages a combination of humans, robots, and agents. Number nine, The Best Time to Build in Crypto. YC is hyped on crypto and building in the bear market is great. And private blockchains. Number 10, Data for the Real World. This is sensors and robots capturing physical world data. Number 11, Proving You're Human. This is building the trust layer against deepfakes. How do you know something is real or not? Number 12, AI-Native Compliance Infrastructure. This is building software compliance tools that helps fragmented operating globally. If you're building in compliance infrastructure, please apply! And finally, 13, Self-Maintaining APIs. This is building agents that auto-fix your code when an API changes. Overall, there are a lot of good ideas here. My top picks are Compute at Sea, AI for the Aging Population, and Data for the Real World. Let me know if you want a deep dive on any of these. I'm happy to do so.