GPT-OSS 120B vs Nemotron Ultra 253B

Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.

Quick Verdict

GPT-OSS 120B wins overall with a score of 42 vs 40 (2 point difference).GPT-OSS 120B wins 4 out of 4 categories.

Knowledge

GPT-OSS 120B

GPT-OSS 120B

48.8

Nemotron Ultra 253B

46.8

51
MMLU
49
50
GPQA
48
48
SuperGPQA
46
46
OpenBookQA
44

Coding

GPT-OSS 120B

GPT-OSS 120B

43

Nemotron Ultra 253B

41

43
HumanEval
41

Mathematics

GPT-OSS 120B

GPT-OSS 120B

50

Nemotron Ultra 253B

48

51
AIME 2023
49
53
AIME 2024
51
52
AIME 2025
50
47
HMMT Feb 2023
45
49
HMMT Feb 2024
47
48
HMMT Feb 2025
46
50
BRUMO 2025
48

Reasoning

GPT-OSS 120B

GPT-OSS 120B

48

Nemotron Ultra 253B

46

49
SimpleQA
47
47
MuSR
45

Frequently Asked Questions

Which is better, GPT-OSS 120B or Nemotron Ultra 253B?

GPT-OSS 120B scores higher overall with 42 vs 40, a difference of 2 points across all benchmarks.

Which is better for knowledge tasks, GPT-OSS 120B or Nemotron Ultra 253B?

GPT-OSS 120B leads in knowledge tasks with an average score of 48.8 vs 46.8.

Which is better for coding, GPT-OSS 120B or Nemotron Ultra 253B?

GPT-OSS 120B leads in coding with an average score of 43 vs 41.

Which is better for math, GPT-OSS 120B or Nemotron Ultra 253B?

GPT-OSS 120B leads in math with an average score of 50 vs 48.

Which is better for reasoning, GPT-OSS 120B or Nemotron Ultra 253B?

GPT-OSS 120B leads in reasoning with an average score of 48 vs 46.