Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
GPT-5 mini is clearly ahead on the aggregate, 74 to 51. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5 mini's sharpest advantage is in mathematics, where it averages 88.5 against 74.3. The single biggest benchmark swing on the page is AIME 2024, 92 to 74.3. o1 does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
o1 gives you the larger context window at 200K, compared with 128K for GPT-5 mini.
Pick GPT-5 mini if you want the stronger benchmark profile. o1 only becomes the better choice if knowledge is the priority or you need the larger 200K context window.
GPT-5 mini
71.5
o1
83.8
GPT-5 mini
52.7
o1
41
GPT-5 mini
88.5
o1
74.3
GPT-5 mini
82
o1
92.2
GPT-5 mini is ahead overall, 74 to 51. The biggest single separator in this matchup is AIME 2024, where the scores are 92 and 74.3.
o1 has the edge for knowledge tasks in this comparison, averaging 83.8 versus 71.5. Inside this category, GPQA is the benchmark that creates the most daylight between them.
GPT-5 mini has the edge for coding in this comparison, averaging 52.7 versus 41. o1 stays close enough that the answer can still flip depending on your workload.
GPT-5 mini has the edge for math in this comparison, averaging 88.5 versus 74.3. Inside this category, AIME 2024 is the benchmark that creates the most daylight between them.
o1 has the edge for instruction following in this comparison, averaging 92.2 versus 82. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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