Evals Shape the Product — Training Is Just an Amplifier

yunta_tsai · x · 2026-09-18

A concise take from yuntatsai: evals shape the product, training is just an amplifier. The implication is that the quality ceiling of an AI product is set by how you design evaluations to define and constrain model behavior — training only amplifies whatever direction your evals anchor, so a wrong direction can't be fixed with more compute. It echoes the growing 'evals-first' school of thought in AI engineering.

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