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Gemini 3.5 Flash vs gpt-oss-120b

Head to head on 17 shared benchmarks, with price, context window, and release dates.

Benchmark scores

43

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Model
Gemini 3.5 Flash

Google (Alphabet Inc.)

64.7%26.0%71.892.2%42.7%76.3%78.9%78.2%64.9%75.6%84.6%88.2%82.0%53.1%74.4%40.9%95.3%----1087elo-57.9%39.0%----76.3%55.8%76.6%--68.1%31.0%49.9%---53.1%62.9%48.7%64.3%
gpt-oss-120b

OpenAI

58.2%13.0%35.878.2%19.6%69.0%51.0%60.2%38.8%50.3%48.6%68.9%39.2%38.9%71.6%23.5%65.8%41.8%93.4%38.9%7.6%-959elo--57.687.8%1.621.53---80.0%80.8%---97.9%26.0%65.6%---54.4%
2 / 2 models
AttributeGemini 3.5 Flash

Google (Alphabet Inc.)

gpt-oss-120b

OpenAI

DescriptionGemini 3.5 Flash is an AI model from Google (Alphabet Inc.).GPT-Oss 120b is an AI model from OpenAI, released with open weights.
FamilyGeminiGPT
Params--
Open weightsclosedopen
Licenseproprietaryapache-2.0
Released19 May 20265 Aug 2025
Context1,048,576131,072
Input $/1M$1.50$0.15
Output $/1M$9.00$0.60
Cache read $/1M$0.150$0.030
Cache write $/1M$0.083-
Speed0 tok/s172 tok/s
Latency0.00 s0.52 s
Modalitiestext, image, video, file, audiotext
Providers--
PublisherGoogle (Alphabet Inc.)OpenAI
Reported scores
GPQA Diamond78.2% (AA)
LiveCodeBench87.8% (AA)
MMLU-Pro80.8% (AA)
SciCode38.9% (AA)

FAQ

Is Gemini 3.5 Flash or gpt-oss-120b better?
Across the 17 benchmarks both models report on Sophon, Gemini 3.5 Flash leads on 17 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do Gemini 3.5 Flash and gpt-oss-120b compare on GPQA Diamond?
Gemini 3.5 Flash scores 92.2% and gpt-oss-120b scores 78.2% on GPQA Diamond.
Which is cheaper, Gemini 3.5 Flash or gpt-oss-120b?
gpt-oss-120b is cheaper at $0.60 per million output tokens against $9.00 for Gemini 3.5 Flash - about 15.0x.
When were Gemini 3.5 Flash and gpt-oss-120b released?
Gemini 3.5 Flash was released 19 May 2026 by Google (Alphabet Inc.). gpt-oss-120b was released 5 Aug 2025 by OpenAI.

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