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GLM 5.1 vs GPT-4.1

Head to head on 11 shared benchmarks, with price, context window, and release dates.

Benchmark scores

62

evals · sort by any column, ⤢ to expand fullscreen

Model
GLM 5.1

Zai

64.5%1589elo33.5%83.9%27.9%52.0%85.4%36.1%71.2%35.6%97.1%-----20.8%-35.9%1.13---40.0%-73.544.8%34.7%-15.1%72.7%75.4%63.2%68.5%71.8%84.9%72.5%-----67.0%--41.6%-72.3%--22.2%-34.6%5.24---69.852.5%31.5%--53.6%
GPT-4.1

OpenAI

63.1%1417elo5.5%66.6%4.2%43.0%80.6%38.1%75.1%13.6%47.1%0.0%52.4%43.7%34.7%26.7%-61.5%--1.6483.7%1.55-12.4%---60.9%--------45.7%70.8%0.490.4991.3%-32.1%32.1%-69.4%-50.5%65.9%-8.57--31.1%39.6%10.0%---92.0%92.0%48.0%
2 / 2 models
AttributeGLM 5.1

Zai

GPT-4.1

OpenAI

DescriptionGLM-5.1 is an AI model from Zai, released with open weights.GPT-4.1 is an AI model from OpenAI.
FamilyGlmGPT
Params--
Open weightsopenclosed
Licensemitproprietary
Released7 Apr 202614 Apr 2025
Context204,8001,047,576
Input $/1M$1.39$2.00
Output $/1M$4.40$8.00
Cache read $/1M$0.234$0.500
Cache write $/1M--
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestextimage, text, file
Providers--
PublisherZaiOpenAI
Reported scores

FAQ

Is GLM 5.1 or GPT-4.1 better?
Across the 11 benchmarks both models report on Sophon, GLM 5.1 leads on 9 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GLM 5.1 and GPT-4.1 compare on GPQA Diamond?
GLM 5.1 scores 83.9% and GPT-4.1 scores 66.6% on GPQA Diamond.
Which is cheaper, GLM 5.1 or GPT-4.1?
GLM 5.1 is cheaper at $4.40 per million output tokens against $8.00 for GPT-4.1 - about 1.8x.
When were GLM 5.1 and GPT-4.1 released?
GLM 5.1 was released 7 Apr 2026 by Zai. GPT-4.1 was released 14 Apr 2025 by OpenAI.

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