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Z.ai (Zhipu AI): GLM-5.1

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z-ai/glm-5.1

GLM-5.1 is Z.ai (Zhipu AI)’s AI model, released Apr 7, 2026. It costs $1.40/M input and $4.40/M output tokens, and handles a 205K-token context window. Its strongest use case is agentic & tools, where it ranks in the 94th percentile of the models Model Beat tracks.

GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks.

Context
205K
Input
$1.40 / 1M
Output
$4.40 / 1M
Cheapest via DigitalOcean
$0.98 / $4.30 / 1M
Released
Apr 7, 2026
Modalities
text→text
Strongest atAgentic & Tools top 6%Math top 37%Coding top 40%

Benchmarks

Scores on standardized evaluations. Higher is better — and rank shows where GLM-5.1 lands among all models tracked on Model Beat.

67.0
Intelligence Index
Epoch AI
67th percentile of tracked models
60.0
Coding Index
Epoch AI
60th percentile of tracked models
94.0
Agentic Index
Epoch AI
94th percentile of tracked models

Reasoning

5 evals
GPQA Diamond85.5%

Graduate-level scientific reasoning

Humanity's Last Exam28.0%

Frontier of human expert knowledge

SimpleBench55.1%

Common-sense trick questions

SimpleQA Verified37.3%

Factual accuracy & hallucination

WeirdML57.1%

Novel ML problem-solving

Coding

3 evals
SciCode43.8%

Scientific research coding

SWE-bench Verified74.2%

Real GitHub issue resolution

WebDev Arena1534

Human-rated web development

Math

3 evals
AIME 2024/202592.2%

Olympiad-qualifier math

FrontierMath33.4%

Research-level math problems

FrontierMath Tier 412.5%

Hardest research math

Agentic & Tools

1 evals
τ²-bench97.7%

Tool-agent-user reliability

In the news

7

Changelog

7
  • GLM-5.1: cheapest credible provider via DigitalOcean now $4.3 per 1M output tokens (was $3.08, +40%)cheapest provider · Jul 30, 2026
  • GLM-5.1: cheapest credible provider via Baidu now $3.08 per 1M output tokens (was $4.3, -28%)cheapest provider · Jul 23, 2026
  • GLM-5.1: context window changed from 202,752 to 204,800 tokenscontext · Jul 21, 2026
  • GLM-5.1: cheapest credible provider via DigitalOcean now $4.3 per 1M output tokens (was $3.08, +40%)cheapest provider · Jul 21, 2026
  • GLM-5.1: cheapest credible provider via Chutes now $3.08 per 1M output tokens (was $4.3, -28%)cheapest provider · Jul 16, 2026
  • GLM-5.1: cheapest credible provider via DigitalOcean now $4.3 per 1M output tokens (was $3.08, +40%)cheapest provider · Jul 14, 2026
  • GLM-5.1: SimpleBench dropped from 58.7% to 55.1% (-6%)benchmark · Jul 10, 2026

Compare GLM-5.1 with

GLM-5.1 vs GPT-5.6 SolGLM-5.1 vs Claude Fable 5GLM-5.1 vs Gemini 3.1 ProGLM-5.1 vs Muse SparkGLM-5.1 vs Grok 4.5

Frequently asked questions

What is GLM-5.1?

GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks.

Who created GLM-5.1?

GLM-5.1 is an AI model developed by Z.ai (Zhipu AI), released Apr 7, 2026.

How much does GLM-5.1 cost?

GLM-5.1's list price from Z.ai (Zhipu AI) is $1.40 per million input tokens and $4.40 per million output tokens. The cheapest credible third-party provider on OpenRouter (DigitalOcean) serves it at $0.98/$4.30 per 1M.

What is GLM-5.1's context window?

GLM-5.1 supports a context window of up to 205K tokens.

How does GLM-5.1 perform on benchmarks?

On standardized evaluations tracked by Epoch AI, GLM-5.1 scores 97.7% on τ²-bench, 1534 on WebDev Arena, 92.2% on AIME 2024/2025.

Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Jul 31, 2026.