benchlm.ai

Gemini 2.5 Flash vs GPT-OSS 120B

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

Quick Verdict

GPT-OSS 120B wins overall with a score of 42 vs 41 (1 point difference).GPT-OSS 120B wins 4 out of 4 categories.

Gemini 2.5 Flash

CreatorGoogle
TypeProprietary
Context1M
Score41

GPT-OSS 120B

CreatorOpenAI
TypeOpen Weight
Context128K
Score42

Knowledge

GPT-OSS 120B

Gemini 2.5 Flash

47.8

GPT-OSS 120B

48.8

50
MMLU
51
49
GPQA
50
47
SuperGPQA
48
45
OpenBookQA
46

Coding

GPT-OSS 120B

Gemini 2.5 Flash

42

GPT-OSS 120B

43

42
HumanEval
43

Mathematics

GPT-OSS 120B

Gemini 2.5 Flash

49

GPT-OSS 120B

50

50
AIME 2023
51
52
AIME 2024
53
51
AIME 2025
52
46
HMMT Feb 2023
47
48
HMMT Feb 2024
49
47
HMMT Feb 2025
48
49
BRUMO 2025
50

Reasoning

GPT-OSS 120B

Gemini 2.5 Flash

47

GPT-OSS 120B

48

48
SimpleQA
49
46
MuSR
47

Frequently Asked Questions

Which is better, Gemini 2.5 Flash or GPT-OSS 120B?

GPT-OSS 120B scores higher overall with 42 vs 41, a difference of 1 points across all benchmarks.

Which is better for knowledge tasks, Gemini 2.5 Flash or GPT-OSS 120B?

GPT-OSS 120B leads in knowledge tasks with an average score of 48.8 vs 47.8.

Which is better for coding, Gemini 2.5 Flash or GPT-OSS 120B?

GPT-OSS 120B leads in coding with an average score of 43 vs 42.

Which is better for math, Gemini 2.5 Flash or GPT-OSS 120B?

GPT-OSS 120B leads in math with an average score of 50 vs 49.

Which is better for reasoning, Gemini 2.5 Flash or GPT-OSS 120B?

GPT-OSS 120B leads in reasoning with an average score of 48 vs 47.

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