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I ran cosine similarity on every YC startup. 2025 batches are 2.5x more repetitive than 2015

This story is from 2026-09-30. It is preserved in the archive; the latest stories are on the live feed.

Everyone says every YC startup is now the same AI agent. I ran cosine similarity on all 6,142 of them to see whether that is true, and by how much. In 2015, one in five companies in a batch had a near twin among earlier YC companies. In 2025 it was two in five. 6,142 Y Combinator companies with a l…

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  1. 2026-09-30 07:32 · DEV Community — AI
    I ran cosine similarity on every YC startup. 2025 batches are 2.5x more repetitive than 2015

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