benchlm.ai

DeepSeek LLM 2.0 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 63 (22 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

DeepSeek LLM 2.0

CreatorDeepSeek
TypeOpen Weight
Context128K
Score63

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Knowledge

GPT-5.3 Codex

DeepSeek LLM 2.0

76.8

GPT-5.3 Codex

96

79
MMLU
99
78
GPQA
97
76
SuperGPQA
95
74
OpenBookQA
93

Coding

GPT-5.3 Codex

DeepSeek LLM 2.0

73

GPT-5.3 Codex

95

73
HumanEval
95

Mathematics

GPT-5.3 Codex

DeepSeek LLM 2.0

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

DeepSeek LLM 2.0

76

GPT-5.3 Codex

94

77
SimpleQA
95
75
MuSR
93

Frequently Asked Questions

Which is better, DeepSeek LLM 2.0 or GPT-5.3 Codex?

GPT-5.3 Codex scores higher overall with 85 vs 63, a difference of 22 points across all benchmarks.

Which is better for knowledge tasks, DeepSeek LLM 2.0 or GPT-5.3 Codex?

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 76.8.

Which is better for coding, DeepSeek LLM 2.0 or GPT-5.3 Codex?

GPT-5.3 Codex leads in coding with an average score of 95 vs 73.

Which is better for math, DeepSeek LLM 2.0 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, DeepSeek LLM 2.0 or GPT-5.3 Codex?

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

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