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GLM 5.1 vs GPT-5

Head to head on 16 shared benchmarks, with price, context window, and release dates.

Benchmark scores

81

evals · sort by any column, ⤢ to expand fullscreen

Model
GPT-5

OpenAI

61.1%1623elo72.832.4%68.6%6.6%45.0%49.6%83.7%82.0%18.0%37.8%73.4%12.9%20.1%0.0%46.7%91.1%88.0%94.6%48.3%-0.0%--0.150.0%68.1%4.58-57.7%80.0%80.0%-91.7%-0.0%88.9%83.3%-100.0%48.9%83.4%58.2%-------54.3%37.5%0.521.62100.0%86.1%-0.0%92.7%92.7%93.3%10.0%0.0%65.5%60.0%0.260.0%43.7%--74.9%74.4%2.34-87.5%0.86-54.8%90.0%90.0%56.7%
GLM 5.1

Zai

64.5%1589elo73.533.5%83.9%27.9%52.0%41.6%72.3%85.4%22.2%36.1%71.2%35.6%31.5%97.1%-----20.8%-35.9%1.13----40.0%---44.8%-34.7%---15.1%----72.7%75.4%63.2%68.5%71.8%84.9%72.5%------67.0%-----------34.6%5.24---69.8--52.5%---53.6%
2 / 2 models
AttributeGLM 5.1

Zai

GPT-5

OpenAI

DescriptionGLM-5.1 is an AI model from Zai, released with open weights.OpenAI's August 2025 unified frontier model that auto-routes between a fast model and a deeper "thinking" variant.
FamilyGlmGPT 5
Params-Undisclosed (closed)
Open weightsopenclosed
LicensemitProprietary
Released7 Apr 20267 Aug 2025
Context204,800400,000
Input $/1M$1.39-
Output $/1M$4.40-
Cache read $/1M$0.234$0.125
Cache write $/1M--
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestexttext, image, file
Providers-openai
PublisherZaiOpenAI
Reported scores

FAQ

Is GLM 5.1 or GPT-5 better?
Across the 16 benchmarks both models report on Sophon, GLM 5.1 leads on 11 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 compare on GPQA Diamond?
GLM 5.1 scores 83.9% and GPT-5 scores 68.6% on GPQA Diamond.
When were GLM 5.1 and GPT-5 released?
GLM 5.1 was released 7 Apr 2026 by Zai. GPT-5 was released 7 Aug 2025 by OpenAI.

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