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Zhipu AI (Z.ai)

GLM 5.1

Benchmarks, price, context and versions

Also searched as

GLM-5.1, glm 5.1 size, glm 5.1 flash, glm 5.1 pricing

Direct answer: GLM 5.1 is a model from Zhipu AI (Z.ai). 89.9% on GPQA Diamond, per Epoch AI. On OpenRouter, US$ 1.40 per 1 million input tokens and US$ 4.40 per 1 million output tokens.

✓ Good for

  • technical reasoning on science topics (#46 of 198 on GPQA Diamond)
  • running on your own infrastructure (open weights)

✕ Not the best for

  • the ceiling of reasoning on research-level math (#60 of 86 on FrontierMath (tiers 1 to 3))
  • answering short facts with little invention (#59 of 87 on SimpleQA Verified)
  • technical reasoning as the model appears through the API (#76 of 135 on GPQA Diamond (OpenRouter))

This block follows a rule of this section, using source data: if the model is in the top 25% of the metric, the item goes under "Good for"; if it is in the bottom half, it goes under "Not the best for". The middle band appears in neither. Price and context use OpenRouter; scores use Epoch AI or OpenRouter Benchmarks, in the latest version we checked.

Benchmarks

GPQA Diamond

?what it is
89.9%

highest score on this metric 96.4%

46º / 198 · Epoch AI, latest version we checked

OTIS Mock AIME

?
93.3%

highest score on this metric 100%

54º / 186 · Epoch AI, latest version we checked

FrontierMath (tiers 1 to 3)

?
36.8%

highest score on this metric 95.1%

60º / 86 · Epoch AI, latest version we checked

SimpleQA Verified

?
34%

highest score on this metric 94%

59º / 87 · Epoch AI, latest version we checked

SWE-bench Verified

?
74.2%

highest score on this metric 83.5%

16º / 32 · Epoch AI, latest version we checked

GPQA Diamond (OpenRouter)

?
84.1%

highest score on this metric 96.5%

76º / 135 · OpenRouter Benchmarks, latest version we checked

τ-bench Verified (airline)

?
75.8%

highest score on this metric 82%

44º / 131 · OpenRouter Benchmarks, latest version we checked

Key specs

Origin
China
Family
GLM provisional data
Weights?
open
License
mit
Input US$/1M?
US$ 1.40
Output US$/1M
US$ 4.40
Context?
204,800 tokens
Parameters
753,864,139,008
Input
text
OpenRouter usage?
no data
Downloads (30 days)?
867,145
Use cases provisional data
Text Agents Code
Dates in sources
  • 2026, published, per Epoch AI
  • 2026, listed on OpenRouter
  • 2026, Hugging Face repo created

Version history

Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch.

FAQ

How much does GLM 5.1 cost?

On OpenRouter, US$ 1.40 per 1 million input tokens and US$ 4.40 per 1 million output tokens.

Is GLM 5.1 open source?

Yes, it has open weights. License: mit.

What is GLM 5.1?

GLM 5.1 is a model from Zhipu AI (Z.ai), with open weights, used for text, agents, code.

What is the context window of GLM 5.1?

204,800 tokens, per OpenRouter.

What is GLM 5.1's GPQA Diamond score?

89.9% on GPQA Diamond, per Epoch AI.

Is GLM 5.1 good for coding?

It scores 74.2% on SWE-bench Verified, per Epoch AI.

Who made GLM 5.1?

It was made by Zhipu AI (Z.ai), a lab from China.

provisional data Questions ordered by what shows up in public Google search suggestions (no volume). Answers use source data only.

Models from Zhipu AI (Z.ai)

See lab

Sources

  • Epoch AI, CC BY 4.0, latest version we checked.
  • Hugging Face Hub, metadados públicos do Hub; licença de cada modelo no repositório, latest version we checked.
  • OpenRouter, dados públicos da API; exports de benchmarks e rankings em CC BY 4.0, latest version we checked.
  • OpenRouter Benchmarks, CC BY 4.0, latest version we checked.

Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch. Family and version were grouped by rule from the name.