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Z.ai (Zhipu AI): GLM-5.3

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z-ai/glm-5.3

GLM-5.3 is Z.ai (Zhipu AI)’s proprietary AI model, released Aug 14, 2026. It costs $1.40/M input and $4.40/M output tokens, and handles a 1M-token context window. Its strongest use case is coding, where it ranks in the 90th percentile of the models Model Beat tracks.

GLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks.

Context
1M
Input
$1.40 / 1M
Output
$4.40 / 1M
Cheapest via Relace
$0.06 / $2.86 / 1M
Released
Aug 14, 2026
Modalities
text→text
Strongest atCoding top 10%Agentic & Tools top 21%Reasoning & Knowledge top 33%

Benchmarks

Scores on standardized evaluations. Higher is better — and rank shows where GLM-5.3 lands among all models tracked on Model Beat.

70.0
Intelligence Index
Epoch AI
70th percentile of tracked models
90.0
Coding Index
Epoch AI
90th percentile of tracked models
79.0
Agentic Index
Epoch AI
79th percentile of tracked models

Reasoning

4 evals
GPQA Diamond90.9%

Graduate-level scientific reasoning

Humanity's Last Exam42.3%

Frontier of human expert knowledge

SimpleQA Verified41.0%

Factual accuracy & hallucination

WeirdML75.4%

Novel ML problem-solving

Coding

2 evals
SciCode59.0%

Scientific research coding

WebDev Arena1614

Human-rated web development

Math

1 evals
AIME 2024/202591.1%

Olympiad-qualifier math

Agentic & Tools

1 evals
APEX56.6%

Multi-step agentic tasks

In the news

12

Changelog

8
  • GLM-5.3: cheapest credible provider via Relace now $0.06 per 1M input tokens (was $0.95, -94%)cheapest provider · Oct 4, 2026
  • GLM-5.3: context window changed from 1,310,720 to 1,048,576 tokenscontext · Sep 30, 2026
  • GLM-5.3: cheapest credible provider via DigitalOcean now $2.86 per 1M output tokens (was $4.4, -35%)cheapest provider · Sep 22, 2026
  • GLM-5.3: cheapest credible provider via Wafer now $0.95 per 1M input tokens (was $1.19, -20%)cheapest provider · Sep 14, 2026
  • GLM-5.3: context window changed from 1,048,576 to 1,310,720 tokenscontext · Sep 9, 2026
  • GLM-5.3: context window changed from 1,310,720 to 1,048,576 tokenscontext · Sep 9, 2026
  • GLM-5.3: cheapest credible provider via Wafer now $1.19 per 1M input tokens (was $1.4, -15%)cheapest provider · Sep 5, 2026
  • GLM-5.3: context window changed from 1,048,576 to 1,310,720 tokenscontext · Aug 28, 2026

Compare GLM-5.3 with

GLM-5.3 vs GPT-6 AstraGLM-5.3 vs Claude Fable 5GLM-5.3 vs Kimi K3GLM-5.3 vs Gemini 3.7 FlashGLM-5.3 vs Grok 4.6

Frequently asked questions

What is GLM-5.3?

GLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks.

Who created GLM-5.3?

GLM-5.3 is an AI model developed by Z.ai (Zhipu AI), released Aug 14, 2026.

How much does GLM-5.3 cost?

GLM-5.3'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 (Relace) serves it at $0.06/$2.86 per 1M.

What is GLM-5.3's context window?

GLM-5.3 supports a context window of up to 1M tokens.

How does GLM-5.3 perform on benchmarks?

On standardized evaluations tracked by Epoch AI, GLM-5.3 scores 59.0% on SciCode, 1614 on WebDev Arena, 42.3% on Humanity's Last Exam.

Is GLM-5.3 open source?

GLM-5.3 is a proprietary model (API access), available through its provider's API rather than as a downloadable open-weight model.

Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Oct 6, 2026.