Gemini 2.5 Flash vs o3-pro

Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.

Quick Verdict

o3-pro wins overall with a score of 68 vs 41 (27 point difference).o3-pro wins 4 out of 4 categories.

Knowledge

o3-pro

Gemini 2.5 Flash

47.8

o3-pro

87.3

50
MMLU
88
49
GPQA
89
47
SuperGPQA
87
45
OpenBookQA
85

Coding

o3-pro

Gemini 2.5 Flash

42

o3-pro

80

42
HumanEval
80

Mathematics

o3-pro

Gemini 2.5 Flash

49

o3-pro

89

50
AIME 2023
90
52
AIME 2024
92
51
AIME 2025
91
46
HMMT Feb 2023
86
48
HMMT Feb 2024
88
47
HMMT Feb 2025
87
49
BRUMO 2025
89

Reasoning

o3-pro

Gemini 2.5 Flash

47

o3-pro

85

48
SimpleQA
86
46
MuSR
84

Frequently Asked Questions

Which is better, Gemini 2.5 Flash or o3-pro?

o3-pro scores higher overall with 68 vs 41, a difference of 27 points across all benchmarks.

Which is better for knowledge tasks, Gemini 2.5 Flash or o3-pro?

o3-pro leads in knowledge tasks with an average score of 87.3 vs 47.8.

Which is better for coding, Gemini 2.5 Flash or o3-pro?

o3-pro leads in coding with an average score of 80 vs 42.

Which is better for math, Gemini 2.5 Flash or o3-pro?

o3-pro leads in math with an average score of 89 vs 49.

Which is better for reasoning, Gemini 2.5 Flash or o3-pro?

o3-pro leads in reasoning with an average score of 85 vs 47.