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GPT-5.4 Mini vs gpt-oss-120b

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

Benchmark scores

44

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Model
gpt-oss-120b

OpenAI

58.2%959elo35.867.2%5.9%58.3%51.0%60.2%38.8%50.3%48.6%68.9%39.2%36.0%71.6%5.3%45.0%41.8%66.7%-38.9%7.6%13.0%----57.6-70.7%1.621.5380.0%77.5%---97.9%26.0%65.6%----49.6%
GPT-5.4 Mini

OpenAI

60.9%1662elo7360.6%5.9%38.8%70.9%71.6%70.9%60.3%71.5%78.6%72.5%39.6%71.2%18.2%23.4%--37.0%---21.2%3.9%45.4%28.3%-80.3%-----63.5%21.0%50.8%---61.739.6%54.2%48.0%48.4%
2 / 2 models
AttributeGPT-5.4 Mini

OpenAI

gpt-oss-120b

OpenAI

DescriptionGPT-5.4 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
Released17 Mar 20265 Aug 2025
Context400,000131,072
Input $/1M$0.75$0.15
Output $/1M$4.50$0.60
Cache read $/1M$0.075$0.030
Cache write $/1M--
Speed0 tok/s186 tok/s
Latency0.00 s0.50 s
Modalitiesfile, image, texttext
Providers--
PublisherOpenAIOpenAI
Reported scores
GPQA Diamond60.6% (AA)
IFBench38.8% (AA)
SciCode39.6% (AA)
GPQA Diamond67.2% (AA)
LiveCodeBench70.7% (AA)
MMLU-Pro77.5% (AA)
SciCode36.0% (AA)

FAQ

Is GPT-5.4 Mini or gpt-oss-120b better?
Across the 17 benchmarks both models report on Sophon, GPT-5.4 Mini leads on 12 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GPT-5.4 Mini and gpt-oss-120b compare on GPQA Diamond?
GPT-5.4 Mini scores 60.6% and gpt-oss-120b scores 67.2% on GPQA Diamond.
Which is cheaper, GPT-5.4 Mini or gpt-oss-120b?
gpt-oss-120b is cheaper at $0.60 per million output tokens against $4.50 for GPT-5.4 Mini - about 7.5x.
When were GPT-5.4 Mini and gpt-oss-120b released?
GPT-5.4 Mini was released 17 Mar 2026 by OpenAI. gpt-oss-120b was released 5 Aug 2025 by OpenAI.

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