Summary
In this Y Combinator Q&A session, YC partners field questions from founders on what makes a startup durable in the current AI moment, covering topics from AI cost curves and co-founder selection to ecosystem building and venture funding strategy. A recurring theme is the speed at which the cost of intelligence is falling — one partner estimates roughly a 10x cost reduction per year — and what that means for software company economics both today and twelve months out.
The conversation addresses practical founder questions: whether technical founders need business co-founders (the answer is generally no — business skills are learnable, technical depth is not), how to build a startup community in underdeveloped regional ecosystems, and whether traditional VC funding paths remain necessary when AI dramatically reduces the cost of early-stage development. Partners push back on the idea that AI makes capital less important, arguing instead that lower costs enable founders to attack harder problems — nuclear reactors, regulated banking infrastructure, disease cures — that require more capital, not less.
One of the more substantive threads concerns AI and human judgment. Both YC partners and audience members express concern about delegating core decision-making to AI tools, drawing an analogy to smartphones and attention: useful at the execution layer, but corrosive to the judgment muscle if allowed to replace reasoning itself. The session also touches on Go Cardless and TransferWise as examples of how a small cluster of ambitious early startups can seed an entire regional ecosystem.
📺 Source: Y Combinator · Published July 25, 2026
🏷️ Format: Interview
