GLM-5.3

glm-5.3

GLM-5.3 is Z.ai’s latest flagship model built for advanced coding, software engineering, and long-horizon agent tasks. With a 1M-token context window, up to 128K output tokens, strong reasoning, and tool-use capabilities, it is ideal for Coding Agents, complex development workflows, and multi-step automation.

Context Window

1M tokens

Maximum Output

128K tokens

Release Date

Aug 19, 2026

Modalities

GLM-5.3 Pricing

Input PriceOutput PriceCache Read
$1.1429/M$4/M$0.2857/M

GLM-5.3 API Capabilities

Reasoning

Supported

Tool calling

Supported

Temperature parameter

Supported

Attachments

Supported

Knowledge Base

—

Endpoint Protocols

Completions APIResponses APIMessages API

GLM-5.3 Model Highlights

GLM-5.3 focuses on complex coding, long-horizon agent tasks, cybersecurity analysis, and adjustable reasoning for demanding text-based engineering work.

Complex Coding

Post-training improvements target complex coding and project-scale engineering tasks that require coordinated reasoning across many steps.

Long-Horizon Agents

The model can retain a task objective while planning, executing, and revising work across extended agent workflows.

Cybersecurity Reasoning

Its post-training develops capabilities for vulnerability discovery and analysis of later-stage exploitation tasks in authorized security work.

GLM-5.3 Use Cases

GLM-5.3 is suited to large software projects, long-running engineering agents, and authorized vulnerability research or code-security review.

Complex Software Engineering

Plan architectural changes, implement features across multiple files, run checks, and revise the solution from execution feedback.

End-to-End Agent Workflows

Carry an engineering task from problem analysis through implementation and validation while managing multi-step dependencies.

Authorized Security Review

Inspect source code for potential vulnerabilities, trace exploitability conditions, and prepare remediation guidance for authorized assessments.

How to Use GLM-5.3 via the TokenHub API

Create API key
import OpenAI from "openai"

const client = new OpenAI({
  apiKey: process.env.TOKENHUB_API_KEY,
  baseURL: "https://us-api.tokenhub.com/v1",
})

const result = await client.chat.completions.create({})
console.log(result.choices[0]?.message?.content)

GLM-5.3 Media and Demos

Selected public announcements, discussions and videos about GLM-5.3.

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GLM-5.3 FAQs

Useful questions about using GLM-5.3 on TokenHub.

What is GLM-5.3?+

GLM-5.3 is Z.ai's flagship text model for complex software engineering and long-horizon agent tasks. It uses the same base model as GLM-5.2, with its improvements coming from post-training.

What is GLM-5.3 best suited for?+

It is well suited to repository-scale coding, debugging, refactoring, terminal workflows, tool-using agents and other multi-step technical tasks that require sustained reasoning.

What are the main strengths of GLM-5.3?+

Its strengths include agentic coding, long-horizon execution, function calling, structured output, context caching and configurable reasoning effort. Z.ai also reports substantial gains in defensive vulnerability analysis.

What limitations and tradeoffs should I consider?+

GLM-5.3 accepts text input only and always uses reasoning. Higher reasoning effort can increase latency and token use. Review generated code and factual claims, and use its security capabilities only in authorized environments.

How do I use GLM-5.3 through TokenHub?+

Choose the glm-5.3 model identifier in a TokenHub API request and use the endpoint and credentials provided by your TokenHub account. Start with a small request and confirm supported parameters before production use.

How is GLM-5.3 priced and available?+

Z.ai lists GLM-5.3 API pricing at $1.40 per million input tokens and $4.40 per million output tokens, and offers it to GLM Coding Plan users. TokenHub pricing, quotas and regional availability may differ, so check the current model page before use.

When should I choose GLM-5.3 over another model?+

Choose it when coding quality, tool use and long-running agent work are priorities. Consider a faster or cheaper model for simple requests, and choose a vision-capable model when the task requires image, screenshot or document understanding.

Ready to use GLM-5.3?

Use one API key to access GLM-5.3 and more AI models through TokenHub.

Create API key