benchlm.ai

DeepSeekMath V2 vs GPT-5.3 Codex

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 64 (21 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

DeepSeekMath V2

CreatorDeepSeek
TypeOpen Weight
Context128K
Score64

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Knowledge

GPT-5.3 Codex

DeepSeekMath V2

77.8

GPT-5.3 Codex

96

80
MMLU
99
79
GPQA
97
77
SuperGPQA
95
75
OpenBookQA
93

Coding

GPT-5.3 Codex

DeepSeekMath V2

72

GPT-5.3 Codex

95

72
HumanEval
95

Mathematics

GPT-5.3 Codex

DeepSeekMath V2

79

GPT-5.3 Codex

97.1

80
AIME 2023
99
82
AIME 2024
99
81
AIME 2025
98
76
HMMT Feb 2023
95
78
HMMT Feb 2024
97
77
HMMT Feb 2025
96
79
BRUMO 2025
96

Reasoning

GPT-5.3 Codex

DeepSeekMath V2

76

GPT-5.3 Codex

94

77
SimpleQA
95
75
MuSR
93

Frequently Asked Questions

Which is better, DeepSeekMath V2 or GPT-5.3 Codex?

GPT-5.3 Codex scores higher overall with 85 vs 64, a difference of 21 points across all benchmarks.

Which is better for knowledge tasks, DeepSeekMath V2 or GPT-5.3 Codex?

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 77.8.

Which is better for coding, DeepSeekMath V2 or GPT-5.3 Codex?

GPT-5.3 Codex leads in coding with an average score of 95 vs 72.

Which is better for math, DeepSeekMath V2 or GPT-5.3 Codex?

GPT-5.3 Codex leads in math with an average score of 97.1 vs 79.

Which is better for reasoning, DeepSeekMath V2 or GPT-5.3 Codex?

GPT-5.3 Codex leads in reasoning with an average score of 94 vs 76.

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