benchlm.ai

DeepSeek V3.1 vs GPT-5.1-Codex-Max

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 24 (53 point difference).GPT-5.1-Codex-Max wins 4 out of 4 categories.

DeepSeek V3.1

CreatorDeepSeek
TypeOpen Weight
Context128K
Score24

GPT-5.1-Codex-Max

CreatorOpenAI
TypeProprietary
Context400K
Score77

Knowledge

GPT-5.1-Codex-Max

DeepSeek V3.1

30.8

GPT-5.1-Codex-Max

95

33
MMLU
98
32
GPQA
96
30
SuperGPQA
94
28
OpenBookQA
92

Coding

GPT-5.1-Codex-Max

DeepSeek V3.1

25

GPT-5.1-Codex-Max

94

25
HumanEval
94

Mathematics

GPT-5.1-Codex-Max

DeepSeek V3.1

32

GPT-5.1-Codex-Max

97.1

33
AIME 2023
99
35
AIME 2024
99
34
AIME 2025
98
29
HMMT Feb 2023
95
31
HMMT Feb 2024
97
30
HMMT Feb 2025
96
32
BRUMO 2025
96

Reasoning

GPT-5.1-Codex-Max

DeepSeek V3.1

30

GPT-5.1-Codex-Max

93

31
SimpleQA
94
29
MuSR
92

Frequently Asked Questions

Which is better, DeepSeek V3.1 or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max scores higher overall with 77 vs 24, a difference of 53 points across all benchmarks.

Which is better for knowledge tasks, DeepSeek V3.1 or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in knowledge tasks with an average score of 95 vs 30.8.

Which is better for coding, DeepSeek V3.1 or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in coding with an average score of 94 vs 25.

Which is better for math, DeepSeek V3.1 or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in math with an average score of 97.1 vs 32.

Which is better for reasoning, DeepSeek V3.1 or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in reasoning with an average score of 93 vs 30.

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