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GLM 5.1 vs GPT-5.4

Head to head on 26 shared benchmarks, with price, context window, and release dates.

Benchmark scores

48

evals · sort by any column, ⤢ to expand fullscreen

Model
GPT-5.4

OpenAI

13.1%65.3%81.0%1836elo78.347.6%74.8%11.3%48.4%82.0%77.5%79.3%70.2%82.6%94.1%88.1%82.8%41.3%77.5%56.0%47.1%74.0%37.9%8067.4%36.0%--1.4734.1%9.0%1272elo--87.2%-78.5%92063-68.3%8652.2%43.3%---0.6140.8-60.3%
GLM 5.1

Zai

35.9%64.5%40.0%1589elo73.533.5%83.9%27.9%52.0%72.7%75.4%63.2%68.5%71.8%84.9%72.5%67.0%41.6%72.3%22.2%36.1%71.2%35.6%69.831.5%97.1%20.8%1.13----44.8%34.7%-15.1%--85.4%----34.6%5.24--52.5%53.6%
2 / 2 models
AttributeGLM 5.1

Zai

GPT-5.4

OpenAI

DescriptionGLM-5.1 is an AI model from Zai, released with open weights.GPT-5.4 is an AI model from OpenAI.
FamilyGlmGPT
Params--
Open weightsopenclosed
Licensemitproprietary
Released7 Apr 20265 Mar 2026
Context204,8001,050,000
Input $/1M$1.39$2.50
Output $/1M$4.40$15.00
Cache read $/1M$0.234$0.250
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-5.4 better?
Across the 26 benchmarks both models report on Sophon, GPT-5.4 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-5.4 compare on GPQA Diamond?
GLM 5.1 scores 83.9% and GPT-5.4 scores 74.8% on GPQA Diamond.
Which is cheaper, GLM 5.1 or GPT-5.4?
GLM 5.1 is cheaper at $4.40 per million output tokens against $15.00 for GPT-5.4 - about 3.4x.
When were GLM 5.1 and GPT-5.4 released?
GLM 5.1 was released 7 Apr 2026 by Zai. GPT-5.4 was released 5 Mar 2026 by OpenAI.

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