benchlm.ai

GPT-5.3 Codex vs Nova Pro

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 32 (53 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Nova Pro

CreatorNova AI
TypeProprietary
Context128K
Score32

Knowledge

GPT-5.3 Codex

GPT-5.3 Codex

96

Nova Pro

38.8

99
MMLU
41
97
GPQA
40
95
SuperGPQA
38
93
OpenBookQA
36

Coding

GPT-5.3 Codex

GPT-5.3 Codex

95

Nova Pro

33

95
HumanEval
33

Mathematics

GPT-5.3 Codex

GPT-5.3 Codex

97.1

Nova Pro

40

99
AIME 2023
41
99
AIME 2024
43
98
AIME 2025
42
95
HMMT Feb 2023
37
97
HMMT Feb 2024
39
96
HMMT Feb 2025
38
96
BRUMO 2025
40

Reasoning

GPT-5.3 Codex

GPT-5.3 Codex

94

Nova Pro

38

95
SimpleQA
39
93
MuSR
37

Frequently Asked Questions

Which is better, GPT-5.3 Codex or Nova Pro?

GPT-5.3 Codex scores higher overall with 85 vs 32, a difference of 53 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.3 Codex or Nova Pro?

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 38.8.

Which is better for coding, GPT-5.3 Codex or Nova Pro?

GPT-5.3 Codex leads in coding with an average score of 95 vs 33.

Which is better for math, GPT-5.3 Codex or Nova Pro?

GPT-5.3 Codex leads in math with an average score of 97.1 vs 40.

Which is better for reasoning, GPT-5.3 Codex or Nova Pro?

GPT-5.3 Codex leads in reasoning with an average score of 94 vs 38.

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