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GPT-5.4 vs gpt-oss-120b

Head to head on 18 shared benchmarks, with price, context window, and release dates.

Benchmark scores

52

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Model
GPT-5.4

OpenAI

65.3%81.0%1836elo78.374.8%11.3%48.4%82.0%77.5%79.3%70.2%82.6%94.1%88.1%47.1%74.0%37.9%36.0%--13.1%--1.4734.1%9.0%1272elo47.6%87.2%-78.5%92063---82.8%41.3%77.5%--68.3%8652.2%56.0%43.3%-0.61-40.8--8067.4%60.3%
gpt-oss-120b

OpenAI

58.2%13.0%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%------57.6--70.7%1.621.53---80.0%77.5%------97.9%-26.0%65.6%--49.6%
2 / 2 models
AttributeGPT-5.4

OpenAI

gpt-oss-120b

OpenAI

DescriptionGPT-5.4 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
Released5 Mar 20265 Aug 2025
Context1,050,000131,072
Input $/1M$2.50$0.15
Output $/1M$15.00$0.60
Cache read $/1M$0.250$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-5.4 or gpt-oss-120b better?
Across the 18 benchmarks both models report on Sophon, GPT-5.4 leads on 16 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GPT-5.4 and gpt-oss-120b compare on GPQA Diamond?
GPT-5.4 scores 74.8% and gpt-oss-120b scores 67.2% on GPQA Diamond.
Which is cheaper, GPT-5.4 or gpt-oss-120b?
gpt-oss-120b is cheaper at $0.60 per million output tokens against $15.00 for GPT-5.4 - about 25.0x.
When were GPT-5.4 and gpt-oss-120b released?
GPT-5.4 was released 5 Mar 2026 by OpenAI. gpt-oss-120b was released 5 Aug 2025 by OpenAI.

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