Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-OSS 120B is clearly ahead on the aggregate, 50 to 23. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-OSS 120B's sharpest advantage is in mathematics, where it averages 52.6 against 9.8. The single biggest benchmark swing on the page is AIME 2024, 53 to 9.8. GPT-4.1 nano does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
GPT-4.1 nano gives you the larger context window at 1M, compared with 128K for GPT-OSS 120B.
Pick GPT-OSS 120B if you want the stronger benchmark profile. GPT-4.1 nano only becomes the better choice if knowledge is the priority or you need the larger 1M context window.
GPT-OSS 120B
43.8
GPT-4.1 nano
65.2
GPT-OSS 120B
52.6
GPT-4.1 nano
9.8
GPT-OSS 120B
79
GPT-4.1 nano
83.2
GPT-OSS 120B is ahead overall, 50 to 23. The biggest single separator in this matchup is AIME 2024, where the scores are 53 and 9.8.
GPT-4.1 nano has the edge for knowledge tasks in this comparison, averaging 65.2 versus 43.8. Inside this category, MMLU is the benchmark that creates the most daylight between them.
GPT-OSS 120B has the edge for math in this comparison, averaging 52.6 versus 9.8. Inside this category, AIME 2024 is the benchmark that creates the most daylight between them.
GPT-4.1 nano has the edge for instruction following in this comparison, averaging 83.2 versus 79. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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