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GPT-5.2 vs gpt-oss-120b

Head to head on 22 shared benchmarks, with price, context window, and release dates.

Benchmark scores

52

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Model
GPT-5.2

OpenAI

51.0%65.9%60.0%1699elo71.671.2%8.0%47.4%78.7%76.1%78.2%61.8%79.8%93.2%83.2%66.9%81.4%40.4%71.8%75.8%31.8%46.5%-100--100.0%0.0%16.7%40.6%9.4%40.7%12.93-85.0%79.0%24.0%--72.0%49.7%84.4%-67.1%96.718.7%15.0%49.3%-66.7%-53.5%56.3%
gpt-oss-120b

OpenAI

66.7%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%70.7%77.5%36.0%26.0%71.6%5.3%45.0%41.8%-38.9%7.6%-------57.6---1.621.53---80.0%-----97.9%-65.6%-49.6%
2 / 2 models
AttributeGPT-5.2

OpenAI

gpt-oss-120b

OpenAI

DescriptionGPT-5.2 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
Released11 Dec 20255 Aug 2025
Context400,000131,072
Input $/1M$1.75$0.15
Output $/1M$14.00$0.60
Cache read $/1M$0.175$0.030
Cache write $/1M--
Speed0 tok/s186 tok/s
Latency0.00 s0.50 s
Modalitiesfile, image, texttext
Providers--
PublisherOpenAIOpenAI
Reported scores
GPQA Diamond67.2% (AA)
LiveCodeBench70.7% (AA)
MMLU-Pro77.5% (AA)
SciCode36.0% (AA)

FAQ

Is GPT-5.2 or gpt-oss-120b better?
Across the 22 benchmarks both models report on Sophon, GPT-5.2 leads on 19 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GPT-5.2 and gpt-oss-120b compare on GPQA Diamond?
GPT-5.2 scores 71.2% and gpt-oss-120b scores 67.2% on GPQA Diamond.
Which is cheaper, GPT-5.2 or gpt-oss-120b?
gpt-oss-120b is cheaper at $0.60 per million output tokens against $14.00 for GPT-5.2 - about 23.3x.
When were GPT-5.2 and gpt-oss-120b released?
GPT-5.2 was released 11 Dec 2025 by OpenAI. gpt-oss-120b was released 5 Aug 2025 by OpenAI.

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