benchlm.ai

DeepSeek V3.2 (Thinking) 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 69 (8 point difference).GPT-5.1-Codex-Max wins 4 out of 4 categories.

DeepSeek V3.2 (Thinking)

CreatorDeepSeek
TypeOpen Weight
Context128K
Score69

GPT-5.1-Codex-Max

CreatorOpenAI
TypeProprietary
Context400K
Score77

Knowledge

GPT-5.1-Codex-Max

DeepSeek V3.2 (Thinking)

84

GPT-5.1-Codex-Max

95

87
MMLU
98
85
GPQA
96
83
SuperGPQA
94
81
OpenBookQA
92

Coding

GPT-5.1-Codex-Max

DeepSeek V3.2 (Thinking)

79

GPT-5.1-Codex-Max

94

79
HumanEval
94

Mathematics

GPT-5.1-Codex-Max

DeepSeek V3.2 (Thinking)

86

GPT-5.1-Codex-Max

97.1

87
AIME 2023
99
89
AIME 2024
99
88
AIME 2025
98
83
HMMT Feb 2023
95
85
HMMT Feb 2024
97
84
HMMT Feb 2025
96
86
BRUMO 2025
96

Reasoning

GPT-5.1-Codex-Max

DeepSeek V3.2 (Thinking)

82

GPT-5.1-Codex-Max

93

83
SimpleQA
94
81
MuSR
92

Frequently Asked Questions

Which is better, DeepSeek V3.2 (Thinking) or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max scores higher overall with 77 vs 69, a difference of 8 points across all benchmarks.

Which is better for knowledge tasks, DeepSeek V3.2 (Thinking) or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in knowledge tasks with an average score of 95 vs 84.

Which is better for coding, DeepSeek V3.2 (Thinking) or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in coding with an average score of 94 vs 79.

Which is better for math, DeepSeek V3.2 (Thinking) or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in math with an average score of 97.1 vs 86.

Which is better for reasoning, DeepSeek V3.2 (Thinking) or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in reasoning with an average score of 93 vs 82.

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