Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
o3-mini is clearly ahead on the aggregate, 56 to 50. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
o3-mini's sharpest advantage is in knowledge, where it averages 82.1 against 43.5. The single biggest benchmark swing on the page is MMLU, 86.9 to 49.
o3-mini gives you the larger context window at 200K, compared with 32K for Nemotron Ultra 253B.
Pick o3-mini if you want the stronger benchmark profile. Nemotron Ultra 253B only becomes the better choice if its workflow or ecosystem matters more than the raw scoreboard.
o3-mini
82.1
Nemotron Ultra 253B
43.5
o3-mini
49.3
Nemotron Ultra 253B
34
o3-mini
87.3
Nemotron Ultra 253B
51.3
o3-mini
93.9
Nemotron Ultra 253B
78
o3-mini is ahead overall, 56 to 50. The biggest single separator in this matchup is MMLU, where the scores are 86.9 and 49.
o3-mini has the edge for knowledge tasks in this comparison, averaging 82.1 versus 43.5. Inside this category, MMLU is the benchmark that creates the most daylight between them.
o3-mini has the edge for coding in this comparison, averaging 49.3 versus 34. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
o3-mini has the edge for math in this comparison, averaging 87.3 versus 51.3. Inside this category, AIME 2024 is the benchmark that creates the most daylight between them.
o3-mini has the edge for instruction following in this comparison, averaging 93.9 versus 78. Inside this category, IFEval is the benchmark that creates the most daylight between them.
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