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Topics for Y Combinator – Fall 2026

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The has posted the topics (products) it wants to cover and support.

Here is a list of them:

  • The Primer – AI education with personalised learning

  • The Future of American Defense (Drones, sensors, interceptors,...)

  • A Cloud for Small Software

  • Multiplayer AI (Teams collaborating with shared AI agents)

  • Compute at Sea (Offshore data centres)

  • AI-Powered Consumer Products for 1 Billion People

  • AI for the Ageing Population

  • New Operating Systems for the Physical World

  • The Best Time to Build in Crypto (stablecoins, agentic commerce)

  • Data for the Real World

  • Proving You're Human

  • AI-Native Compliance Infrastructure

  • Self-Maintaining APIs

Which of these do you find most interesting, and which ones are missing from the list?

As for me, I like the topics: AI for the Ageing Population and Proving You're Human.

But what I am really missing is AI for health care and longevity.

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Here's something that's been on my mind. Look at this verification code — I'm still young, yet I already find it hard to complete. I can only imagine how much more difficult it must be for the elderly. This may be an extreme example, but even ordinary CAPTCHAs aren't easy; sometimes I only pass them by chance.　

Submitted an application:


AI-Powered Consumer Products for 1 Billion People. Any chances? I guess not ) But we need to try

AI-Powered Consumer Products for 1 Billion People is the one I'd bet on, consumer AI is still mostly chat wrappers and the tools people use daily haven't been rebuilt yet. What I'm missing on that list is anything about trust: the products that win the next billion will be the ones that can prove where your data goes, not just promise it. Proving You're Human is close, but it solves that for platforms, not for people.

Proving You're Human is the one I'd bet on and also the one I think gets built wrong first. Nearly every version I've seen verifies a human was there at signup, which isn't the same as a human being there for the action that matters. We saw a small version of that on free credits at Zeplik, and nothing at the signup gate helped, the only useful signal showed up mid session. What I'd add to the list is the unglamorous other half of Multiplayer AI, the record of what a shared agent actually did once it was allowed to act. Everyone is building the permission and nobody is building the receipt.

Self-maintaining API's really caught my eye here. That's a real problem out there that I am currently facing with my build, so definitely a lot of potential there.

Proving You're Human is going to be huuuuge 😁

I really like AI for the Ageing Population from this list. And of course, Proving You’re Human - maybe the big thing we all need today =)