GLM (General Language Model) is a family of large language models developed by Z.ai, the company formerly known as Zhipu AI, a spin-off from Tsinghua University. GLM models power the ChatGLM assistant and are widely used by developers through open weights and an API.

The latest GLM 5 generation is built for coding, multi-step reasoning, and agentic workflows. With a context window of up to 1 million tokens, it can work with entire codebases and long documents while staying fast and affordable.

Advanced Coding

Write, refactor, and debug code in popular languages, from quick scripts to full-stack projects.

Agentic Task Planning

Break complex goals into steps, follow detailed instructions, and carry out multi-step tasks.

Deep Reasoning

Think step by step through logic problems, technical questions, and complex analysis.

Long Document Analysis

Work with up to 1M tokens of context to analyze long reports, contracts, and codebases.

Multilingual Fluency

Native-level Chinese and English, plus solid support for many other languages.

Content Writing

Draft articles, emails, summaries, and marketing copy in a clear, natural style.

GLM 5

Z.ai's most capable model for complex coding, multi-step agentic work, and deep reasoning - with a 1M-token context window.

GLM 5 Flash

The speed-optimized GLM 5 model. Quick answers for everyday tasks, coding help, and long texts - free to use.

Open the chat

Click "Open Chat" to start using GLM for free - no account needed.

Describe your task

Type a question, paste code, or describe what you need done.

Get a detailed answer

GLM reasons through your request and returns a structured response.

Refine the result

Ask follow-up questions or add context to improve the answer.

Copy your results

Copy the response or code straight into your project.

Yes, GLM is available for free on chatai.org. No registration required.

GLM is developed by Z.ai (formerly Zhipu AI), an AI company founded in 2019 by researchers from Tsinghua University in Beijing.

Z.ai releases many GLM models with open weights, so developers can download them and run them on their own hardware.

Yes. Coding and agentic tasks are among GLM's main strengths, and it performs well on popular coding benchmarks.

The latest GLM 5 models support up to 1 million tokens - enough for whole codebases or very long documents.

GLM is built by Z.ai and offers open-weight models with a strong focus on coding and agents, while GPT is OpenAI's proprietary model family.

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GLM vs Perplexity

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GLM: Z.ai's Open AI Model

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