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GLM 5.1 vs GPT-5 Nano

Head to head on 21 shared benchmarks, with price, context window, and release dates.

Benchmark scores

63

evals · sort by any column, ⤢ to expand fullscreen

Model
GLM 5.1

Zai

1589elo73.533.5%83.9%27.9%52.0%72.7%75.4%63.2%68.5%71.8%84.9%72.5%41.6%72.3%85.4%22.2%36.1%71.2%35.6%97.1%--20.8%35.9%1.13---64.5%40.0%-44.8%-34.7%-15.1%------67.0%------34.6%5.24--69.8-52.5%--31.5%---53.6%
GPT-5 Nano

OpenAI

703elo288.3%42.8%4.0%32.5%52.8%62.4%43.4%55.7%46.8%68.4%40.3%30.4%72.9%55.6%12.0%29.1%67.4%6.8%25.7%0.0%27.3%---0.250.216.7%--10.0%-78.2%-1.18-100.0%47.0%1.381.38100.0%100.0%-26.7%53.6%100.0%0.0%0.0%30.4%--1.7234.8%-29.7%-20.41-6.67-82.0%82.0%40.0%43.7%
2 / 2 models
AttributeGLM 5.1

Zai

GPT-5 Nano

OpenAI

DescriptionGLM-5.1 is an AI model from Zai, released with open weights.GPT-5 nano is an AI model from OpenAI.
FamilyGlmGPT
Params--
Open weightsopenclosed
Licensemitproprietary
Released7 Apr 20267 Aug 2025
Context204,800400,000
Input $/1M$1.39$0.05
Output $/1M$4.40$0.40
Cache read $/1M$0.234$0.005
Cache write $/1M--
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestexttext, image, file
Providers--
PublisherZaiOpenAI
Reported scores

FAQ

Is GLM 5.1 or GPT-5 Nano better?
Across the 21 benchmarks both models report on Sophon, GLM 5.1 leads on 20 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GLM 5.1 and GPT-5 Nano compare on GPQA Diamond?
GLM 5.1 scores 83.9% and GPT-5 Nano scores 42.8% on GPQA Diamond.
Which is cheaper, GLM 5.1 or GPT-5 Nano?
GPT-5 Nano is cheaper at $0.40 per million output tokens against $4.40 for GLM 5.1 - about 11.0x.
When were GLM 5.1 and GPT-5 Nano released?
GLM 5.1 was released 7 Apr 2026 by Zai. GPT-5 Nano was released 7 Aug 2025 by OpenAI.

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