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What is GPQA?
Last reviewed July 16, 2026
GPQA (Graduate-Level Google-Proof Q&A) is a benchmark of PhD-level multiple-choice questions in biology, physics, and chemistry, written and validated by domain experts. The commonly reported GPQA Diamond subset has 198 questions chosen to be search-resistant: experts score around 65%, while skilled non-experts with web access score little better than chance. It is the standard measure of expert scientific reasoning in AI models.
Why Google-proof matters
Questions were kept only when experts answered them correctly and skilled non-experts failed even with the web available. That construction filters out lookup and pattern-matching: a high GPQA score means the model reasons through graduate-level material rather than retrieving it. It also makes the benchmark harder to game with training-data contamination.
How to read a GPQA score
Scores are the fraction of the 198 Diamond questions answered correctly. The expert human baseline is about 65%, so models above it exceed domain experts on this format. Each question is worth about half a percentage point, so treat close scores as ties, and weigh GPQA alongside broader suites.
Top models on GPQA
Full leaderboardPeak scores from the compiled benchmark data; reasoning models use their highest effort tier.
idapt's rankings order the catalog by GPQA Diamond, model pages show each model's score beside its price, and the compare view puts several models' benchmark rows side by side.
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