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Gemini 3 Pro Deep Think vs GPT-OSS 120B

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

Quick Verdict

Gemini 3 Pro Deep Think wins overall with a score of 81 vs 42 (39 point difference).Gemini 3 Pro Deep Think wins 4 out of 4 categories.

Gemini 3 Pro Deep Think

CreatorGoogle
TypeProprietary
Context2M
Score81

GPT-OSS 120B

CreatorOpenAI
TypeOpen Weight
Context128K
Score42

Knowledge

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

96

GPT-OSS 120B

48.8

99
MMLU
51
97
GPQA
50
95
SuperGPQA
48
93
OpenBookQA
46

Coding

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

91

GPT-OSS 120B

43

91
HumanEval
43

Mathematics

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

97.1

GPT-OSS 120B

50

99
AIME 2023
51
99
AIME 2024
53
98
AIME 2025
52
95
HMMT Feb 2023
47
97
HMMT Feb 2024
49
96
HMMT Feb 2025
48
96
BRUMO 2025
50

Reasoning

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

94

GPT-OSS 120B

48

95
SimpleQA
49
93
MuSR
47

Frequently Asked Questions

Which is better, Gemini 3 Pro Deep Think or GPT-OSS 120B?

Gemini 3 Pro Deep Think scores higher overall with 81 vs 42, a difference of 39 points across all benchmarks.

Which is better for knowledge tasks, Gemini 3 Pro Deep Think or GPT-OSS 120B?

Gemini 3 Pro Deep Think leads in knowledge tasks with an average score of 96 vs 48.8.

Which is better for coding, Gemini 3 Pro Deep Think or GPT-OSS 120B?

Gemini 3 Pro Deep Think leads in coding with an average score of 91 vs 43.

Which is better for math, Gemini 3 Pro Deep Think or GPT-OSS 120B?

Gemini 3 Pro Deep Think leads in math with an average score of 97.1 vs 50.

Which is better for reasoning, Gemini 3 Pro Deep Think or GPT-OSS 120B?

Gemini 3 Pro Deep Think leads in reasoning with an average score of 94 vs 48.

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