Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.
Nemotron Ultra 253B is clearly ahead on the aggregate, 50 to 31. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5 nano gives you the larger context window at 400K, compared with 32K for Nemotron Ultra 253B.
Pick Nemotron Ultra 253B if you want the stronger benchmark profile. GPT-5 nano only becomes the better choice if mathematics is the priority or you need the larger 400K context window.
Nemotron Ultra 253B
43.5
GPT-5 nano
71.2
Nemotron Ultra 253B
51.3
GPT-5 nano
85.2
Nemotron Ultra 253B is ahead overall, 50 to 31. The biggest single separator in this matchup is AIME 2025, where the scores are 50 and 85.2.
GPT-5 nano has the edge for knowledge tasks in this comparison, averaging 71.2 versus 43.5. Inside this category, GPQA is the benchmark that creates the most daylight between them.
GPT-5 nano has the edge for math in this comparison, averaging 85.2 versus 51.3. Inside this category, AIME 2025 is the benchmark that creates the most daylight between them.
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