benchlm.ai

GPT-5.3 Codex vs Nemotron-4 15B

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

Quick Verdict

GPT-5.3 Codex wins overall with a score of 85 vs 45 (40 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Nemotron-4 15B

CreatorNVIDIA
TypeOpen Weight
Context32K
Score45

Knowledge

GPT-5.3 Codex

GPT-5.3 Codex

96

Nemotron-4 15B

51.8

99
MMLU
54
97
GPQA
53
95
SuperGPQA
51
93
OpenBookQA
49

Coding

GPT-5.3 Codex

GPT-5.3 Codex

95

Nemotron-4 15B

46

95
HumanEval
46

Mathematics

GPT-5.3 Codex

GPT-5.3 Codex

97.1

Nemotron-4 15B

53

99
AIME 2023
54
99
AIME 2024
56
98
AIME 2025
55
95
HMMT Feb 2023
50
97
HMMT Feb 2024
52
96
HMMT Feb 2025
51
96
BRUMO 2025
53

Reasoning

GPT-5.3 Codex

GPT-5.3 Codex

94

Nemotron-4 15B

51

95
SimpleQA
52
93
MuSR
50

Frequently Asked Questions

Which is better, GPT-5.3 Codex or Nemotron-4 15B?

GPT-5.3 Codex scores higher overall with 85 vs 45, a difference of 40 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.3 Codex or Nemotron-4 15B?

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 51.8.

Which is better for coding, GPT-5.3 Codex or Nemotron-4 15B?

GPT-5.3 Codex leads in coding with an average score of 95 vs 46.

Which is better for math, GPT-5.3 Codex or Nemotron-4 15B?

GPT-5.3 Codex leads in math with an average score of 97.1 vs 53.

Which is better for reasoning, GPT-5.3 Codex or Nemotron-4 15B?

GPT-5.3 Codex leads in reasoning with an average score of 94 vs 51.

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