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GPT-5 vs gpt-oss-120b

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

Benchmark scores

76

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Model
GPT-5

OpenAI

88.0%48.3%61.1%1623elo72.868.6%6.6%45.0%54.3%0.521.6282.0%37.8%74.4%73.4%12.9%0.0%46.7%91.1%94.6%0.0%--0.150.0%68.1%4.58-57.7%80.0%80.0%91.7%32.4%0.0%88.9%83.3%100.0%-48.9%83.4%58.2%-------37.5%100.0%86.1%0.0%92.7%92.7%49.6%83.7%93.3%-10.0%0.0%65.5%60.0%0.260.0%18.0%43.7%-74.9%2.34-87.5%0.8620.1%54.8%90.0%90.0%56.7%
gpt-oss-120b

OpenAI

41.8%66.7%58.2%959elo35.867.2%5.9%58.3%70.7%1.621.5377.5%36.0%26.0%71.6%5.3%45.0%----38.9%7.6%----13.0%---------57.6---51.0%60.2%38.8%50.3%48.6%68.9%39.2%---------80.0%--------97.9%--65.6%------49.6%
2 / 2 models
AttributeGPT-5

OpenAI

gpt-oss-120b

OpenAI

DescriptionOpenAI's August 2025 unified frontier model that auto-routes between a fast model and a deeper "thinking" variant.GPT-Oss 120b is an AI model from OpenAI, released with open weights.
FamilyGPT 5GPT
ParamsUndisclosed (closed)-
Open weightsclosedopen
LicenseProprietaryapache-2.0
Released7 Aug 20255 Aug 2025
Context400,000131,072
Input $/1M-$0.15
Output $/1M-$0.60
Cache read $/1M$0.125$0.030
Cache write $/1M--
Speed0 tok/s186 tok/s
Latency0.00 s0.50 s
Modalitiestext, image, filetext
Providersopenai-
PublisherOpenAIOpenAI
Reported scores
GPQA Diamond67.2% (AA)
LiveCodeBench70.7% (AA)
MMLU-Pro77.5% (AA)
SciCode36.0% (AA)

FAQ

Is GPT-5 or gpt-oss-120b better?
Across the 17 benchmarks both models report on Sophon, GPT-5 leads on 12 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GPT-5 and gpt-oss-120b compare on GPQA Diamond?
GPT-5 scores 68.6% and gpt-oss-120b scores 67.2% on GPQA Diamond.
When were GPT-5 and gpt-oss-120b released?
GPT-5 was released 7 Aug 2025 by OpenAI. gpt-oss-120b was released 5 Aug 2025 by OpenAI.

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