Hamel Husain: build private evals with 10-20 cases, understand them atomically

HamelHusain · x · 2026-11-06

In a discussion with isidoremiller about whether private evals inevitably suck, Hamel Husain shares a concrete method: yes, they can — so build a private eval set with just 10 or 20 cases and maniacally understand them at the atomic level, forgetting statistical significance.

His take: public benchmarks are trash because they must be 'big' to achieve statistical reliability, but that's orthogonal to the insight engineering decisions actually need — a small, deeply understood test set on your real system beats a large abstract benchmark.

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