Y Combinator General Partner Diana Hu shares data from the Winter 2026 application cycle regarding founders' preferred LLM APIs.
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Diana Hu: Supabase is the default backend recommendation across all LLMs
“Whenever someone asks how to set up anything that you need, some sort of backend, Firebase type of transaction, the default answer from all the LLMs is actually a Superbase.”
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Diana Hu: AI's future Google- and Facebook-scale startups have not started yet
“Startups like the future Facebook or the future Google are yet to be started because those come in in the deployment phase, because right now I think these things, things are still getting built up.”
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Hu: A YC startup's 8B model beat OpenAI on healthcare benchmarks
“There's this particular YCE startup that told me that they collected the best data set for healthcare. And they ended up performing better than OpenAI and a lot of the benchmarks for healthcare with only eight billion parameters.”
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Hu: Cursor scaled from $1M to $100M revenue in one year
“We've seen crazy growth unlike anything, only possible with, right now with AI, like all these companies that we work with, zero to twelve million in 12 months. The cursor story where they went zero to one in one year, the next one to a hundred. This is, like,…”
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Hu: Software engineers will transition to product engineers
“I think one of them that I can read verbatim is, I think the role of software engineer will transition to product engineer. Human taste is now more important than ever as CogenTools make everyone a Tenex engineer.”
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Hu: YC founders rarely use Devin for serious features
“Notable, Devon does get mentioned, but the drawback of Devon not really being used for serious features is that it doesn't really understand the code base. It's being used mostly for small features and barely, it's like barely mentioned.”