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GLM 5.1 vs gpt-oss-120b

Head to head on 19 shared benchmarks, with price, context window, and release dates.

Benchmark scores

47

evals · sort by any column, ⤢ to expand fullscreen

Model
GLM 5.1

Zai

64.5%40.0%1589elo73.583.9%27.9%52.0%72.7%75.4%63.2%68.5%71.8%84.9%72.5%85.4%36.1%71.2%35.6%97.1%--20.8%35.9%1.13--44.8%33.5%34.7%15.1%----67.0%41.6%72.3%-22.2%34.6%5.24---69.852.5%31.5%53.6%
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%77.5%36.0%71.6%5.3%45.0%41.8%66.7%---38.9%7.6%----57.670.7%1.621.53---80.0%---97.9%26.0%65.6%---49.6%
2 / 2 models
AttributeGLM 5.1

Zai

gpt-oss-120b

OpenAI

DescriptionGLM-5.1 is an AI model from Zai, released with open weights.GPT-Oss 120b is an AI model from OpenAI, released with open weights.
FamilyGlmGPT
Params--
Open weightsopenopen
Licensemitapache-2.0
Released7 Apr 20265 Aug 2025
Context204,800131,072
Input $/1M$1.39$0.15
Output $/1M$4.40$0.60
Cache read $/1M$0.234$0.030
Cache write $/1M--
Speed0 tok/s186 tok/s
Latency0.00 s0.50 s
Modalitiestexttext
Providers--
PublisherZaiOpenAI
Reported scores
GPQA Diamond67.2% (AA)
LiveCodeBench70.7% (AA)
MMLU-Pro77.5% (AA)
SciCode36.0% (AA)

FAQ

Is GLM 5.1 or gpt-oss-120b better?
Across the 19 benchmarks both models report on Sophon, GLM 5.1 leads on 17 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GLM 5.1 and gpt-oss-120b compare on GPQA Diamond?
GLM 5.1 scores 83.9% and gpt-oss-120b scores 67.2% on GPQA Diamond.
Which is cheaper, GLM 5.1 or gpt-oss-120b?
gpt-oss-120b is cheaper at $0.60 per million output tokens against $4.40 for GLM 5.1 - about 7.3x.
When were GLM 5.1 and gpt-oss-120b released?
GLM 5.1 was released 7 Apr 2026 by Zai. gpt-oss-120b was released 5 Aug 2025 by OpenAI.

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