benchlm.ai

GPT-5.1-Codex-Max vs Nemotron Ultra 253B

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

Quick Verdict

GPT-5.1-Codex-Max wins overall with a score of 77 vs 40 (37 point difference).GPT-5.1-Codex-Max wins 4 out of 4 categories.

GPT-5.1-Codex-Max

CreatorOpenAI
TypeProprietary
Context400K
Score77

Nemotron Ultra 253B

CreatorNVIDIA
TypeOpen Weight
Context32K
Score40

Knowledge

GPT-5.1-Codex-Max

GPT-5.1-Codex-Max

95

Nemotron Ultra 253B

46.8

98
MMLU
49
96
GPQA
48
94
SuperGPQA
46
92
OpenBookQA
44

Coding

GPT-5.1-Codex-Max

GPT-5.1-Codex-Max

94

Nemotron Ultra 253B

41

94
HumanEval
41

Mathematics

GPT-5.1-Codex-Max

GPT-5.1-Codex-Max

97.1

Nemotron Ultra 253B

48

99
AIME 2023
49
99
AIME 2024
51
98
AIME 2025
50
95
HMMT Feb 2023
45
97
HMMT Feb 2024
47
96
HMMT Feb 2025
46
96
BRUMO 2025
48

Reasoning

GPT-5.1-Codex-Max

GPT-5.1-Codex-Max

93

Nemotron Ultra 253B

46

94
SimpleQA
47
92
MuSR
45

Frequently Asked Questions

Which is better, GPT-5.1-Codex-Max or Nemotron Ultra 253B?

GPT-5.1-Codex-Max scores higher overall with 77 vs 40, a difference of 37 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.1-Codex-Max or Nemotron Ultra 253B?

GPT-5.1-Codex-Max leads in knowledge tasks with an average score of 95 vs 46.8.

Which is better for coding, GPT-5.1-Codex-Max or Nemotron Ultra 253B?

GPT-5.1-Codex-Max leads in coding with an average score of 94 vs 41.

Which is better for math, GPT-5.1-Codex-Max or Nemotron Ultra 253B?

GPT-5.1-Codex-Max leads in math with an average score of 97.1 vs 48.

Which is better for reasoning, GPT-5.1-Codex-Max or Nemotron Ultra 253B?

GPT-5.1-Codex-Max leads in reasoning with an average score of 93 vs 46.

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