benchlm.ai

Gemini 2.5 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 41 (36 point difference).GPT-5.1-Codex-Max wins 4 out of 4 categories.

Gemini 2.5 Flash

CreatorGoogle
TypeProprietary
Context1M
Score41

GPT-5.1-Codex-Max

CreatorOpenAI
TypeProprietary
Context400K
Score77

Knowledge

GPT-5.1-Codex-Max

Gemini 2.5 Flash

47.8

GPT-5.1-Codex-Max

95

50
MMLU
98
49
GPQA
96
47
SuperGPQA
94
45
OpenBookQA
92

Coding

GPT-5.1-Codex-Max

Gemini 2.5 Flash

42

GPT-5.1-Codex-Max

94

42
HumanEval
94

Mathematics

GPT-5.1-Codex-Max

Gemini 2.5 Flash

49

GPT-5.1-Codex-Max

97.1

50
AIME 2023
99
52
AIME 2024
99
51
AIME 2025
98
46
HMMT Feb 2023
95
48
HMMT Feb 2024
97
47
HMMT Feb 2025
96
49
BRUMO 2025
96

Reasoning

GPT-5.1-Codex-Max

Gemini 2.5 Flash

47

GPT-5.1-Codex-Max

93

48
SimpleQA
94
46
MuSR
92

Frequently Asked Questions

Which is better, Gemini 2.5 Flash or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max scores higher overall with 77 vs 41, a difference of 36 points across all benchmarks.

Which is better for knowledge tasks, Gemini 2.5 Flash or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in knowledge tasks with an average score of 95 vs 47.8.

Which is better for coding, Gemini 2.5 Flash or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in coding with an average score of 94 vs 42.

Which is better for math, Gemini 2.5 Flash or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in math with an average score of 97.1 vs 49.

Which is better for reasoning, Gemini 2.5 Flash or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in reasoning with an average score of 93 vs 47.

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