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GPT-5 Mini vs gpt-oss-120b

Head to head on 25 shared benchmarks, with price, context window, and release dates.

Benchmark scores

71

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Model
gpt-oss-120b

OpenAI

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

OpenAI

0.0%46.7%0.0%60.2%1310elo56.268.7%5.1%45.6%69.1%68.2%55.2%65.3%75.5%82.2%68.3%54.5%1.541.5477.5%36.9%59.8%75.2%14.4%31.9%0.0%1.13--0.1520.0%25.0%40.0%1.7-100.0%18.1%2.8%100.0%66.7%0.0%88.3%27.2%60.0%100.0%90.0%-47.2%80.0%0.0%43.0%80.6%80.0%-66.9%9.0%43.0%16.8%4.95-39.7%0.0%-9.5%0.0%86.1%0.4939.21272.1114.2%86.0%86.0%47.9%
2 / 2 models
AttributeGPT-5 Mini

OpenAI

gpt-oss-120b

OpenAI

DescriptionGPT-5 mini is an AI model from OpenAI.GPT-Oss 120b is an AI model from OpenAI, released with open weights.
FamilyGPTGPT
Params--
Open weightsclosedopen
Licenseproprietaryapache-2.0
Released7 Aug 20255 Aug 2025
Context400,000131,072
Input $/1M$0.25$0.15
Output $/1M$2.00$0.60
Cache read $/1M$0.025$0.030
Cache write $/1M--
Speed0 tok/s186 tok/s
Latency0.00 s0.50 s
Modalitiestext, image, filetext
Providers--
PublisherOpenAIOpenAI
Reported scores
GPQA Diamond67.2% (AA)
LiveCodeBench70.7% (AA)
MMLU-Pro77.5% (AA)
SciCode36.0% (AA)

FAQ

Is GPT-5 Mini or gpt-oss-120b better?
Across the 25 benchmarks both models report on Sophon, GPT-5 Mini leads on 16 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GPT-5 Mini and gpt-oss-120b compare on GPQA Diamond?
GPT-5 Mini scores 68.7% and gpt-oss-120b scores 67.2% on GPQA Diamond.
Which is cheaper, GPT-5 Mini or gpt-oss-120b?
gpt-oss-120b is cheaper at $0.60 per million output tokens against $2.00 for GPT-5 Mini - about 3.3x.
When were GPT-5 Mini and gpt-oss-120b released?
GPT-5 Mini was released 7 Aug 2025 by OpenAI. gpt-oss-120b was released 5 Aug 2025 by OpenAI.

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