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GLM 5 vs GLM 5.1

Head to head on 20 shared benchmarks, with price, context window, and release dates.

Benchmark scores

44

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Model
GLM 5

Zai

62.9%1598elo70.916.4%66.6%7.6%55.2%71.2%73.6%67.9%55.3%77.5%83.5%69.1%65.2%38.3%70.0%39.4%23.4%97.4%----7.9%-24.7%--97.982.7%48395------73.369.7%72.8%61.12--56.4%
GLM 5.1

Zai

64.5%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%36.1%71.2%35.6%31.5%97.1%20.8%35.9%1.1340.0%-44.8%-34.7%15.1%---41.6%72.3%85.4%22.2%34.6%5.24----69.852.5%53.6%
2 / 2 models
AttributeGLM 5

Zai

GLM 5.1

Zai

DescriptionGLM-5 is an AI model from Zai, released with open weights.GLM-5.1 is an AI model from Zai, released with open weights.
FamilyGlmGlm
Params--
Open weightsopenopen
Licensemitmit
Released11 Feb 20267 Apr 2026
Context204,800204,800
Input $/1M$1.00$1.39
Output $/1M$3.20$4.40
Cache read $/1M$0.120$0.234
Cache write $/1M--
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestexttext
Providers--
PublisherZaiZai
Reported scores

FAQ

Is GLM 5 or GLM 5.1 better?
Across the 20 benchmarks both models report on Sophon, GLM 5.1 leads on 13 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GLM 5 and GLM 5.1 compare on GPQA Diamond?
GLM 5 scores 66.6% and GLM 5.1 scores 83.9% on GPQA Diamond.
Which is cheaper, GLM 5 or GLM 5.1?
GLM 5 is cheaper at $3.20 per million output tokens against $4.40 for GLM 5.1 - about 1.4x.
When were GLM 5 and GLM 5.1 released?
GLM 5 was released 11 Feb 2026 by Zai. GLM 5.1 was released 7 Apr 2026 by Zai.

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