benchlm.ai

Gemini 3 Flash 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 58 (19 point difference).GPT-5.1-Codex-Max wins 4 out of 4 categories.

Gemini 3 Flash

CreatorGoogle
TypeProprietary
Context1M
Score58

GPT-5.1-Codex-Max

CreatorOpenAI
TypeProprietary
Context400K
Score77

Knowledge

GPT-5.1-Codex-Max

Gemini 3 Flash

67.8

GPT-5.1-Codex-Max

95

70
MMLU
98
69
GPQA
96
67
SuperGPQA
94
65
OpenBookQA
92

Coding

GPT-5.1-Codex-Max

Gemini 3 Flash

62

GPT-5.1-Codex-Max

94

62
HumanEval
94

Mathematics

GPT-5.1-Codex-Max

Gemini 3 Flash

69

GPT-5.1-Codex-Max

97.1

70
AIME 2023
99
72
AIME 2024
99
71
AIME 2025
98
66
HMMT Feb 2023
95
68
HMMT Feb 2024
97
67
HMMT Feb 2025
96
69
BRUMO 2025
96

Reasoning

GPT-5.1-Codex-Max

Gemini 3 Flash

66

GPT-5.1-Codex-Max

93

67
SimpleQA
94
65
MuSR
92

Frequently Asked Questions

Which is better, Gemini 3 Flash or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max scores higher overall with 77 vs 58, a difference of 19 points across all benchmarks.

Which is better for knowledge tasks, Gemini 3 Flash or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in knowledge tasks with an average score of 95 vs 67.8.

Which is better for coding, Gemini 3 Flash or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in coding with an average score of 94 vs 62.

Which is better for math, Gemini 3 Flash or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in math with an average score of 97.1 vs 69.

Which is better for reasoning, Gemini 3 Flash or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in reasoning with an average score of 93 vs 66.

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