Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
o1-preview is clearly ahead on the aggregate, 83 to 31. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
o1-preview's sharpest advantage is in mathematics, where it averages 93.1 against 85.2. The single biggest benchmark swing on the page is GPQA, 90 to 71.2.
GPT-5 nano gives you the larger context window at 400K, compared with 200K for o1-preview.
Pick o1-preview if you want the stronger benchmark profile. GPT-5 nano only becomes the better choice if you need the larger 400K context window.
o1-preview
78
GPT-5 nano
71.2
o1-preview
93.1
GPT-5 nano
85.2
o1-preview is ahead overall, 83 to 31. The biggest single separator in this matchup is GPQA, where the scores are 90 and 71.2.
o1-preview has the edge for knowledge tasks in this comparison, averaging 78 versus 71.2. Inside this category, GPQA is the benchmark that creates the most daylight between them.
o1-preview has the edge for math in this comparison, averaging 93.1 versus 85.2. Inside this category, AIME 2025 is the benchmark that creates the most daylight between them.
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