# Z.ai Releases 355B Parameter GLM-4.5 Under MIT License

> The new Mixture-of-Experts model combines massive scale with a fully permissive license, targeting complex reasoning and agentic applications.

Published by The Open Weights on Jul 20, 2025. Canonical: https://theopenweights.com/news/glm-4-5-6wo9

## Key facts

- Company: Zhipu AI
- Model: GLM-4.6
- Version: GLM-4.5
- Category: Text / LLM
- Modalities: Reasoning, Text / LLM, Code
- License: MIT (Open weights, commercial use allowed)
- Parameters: 355B (mixture of experts)
- Context window: 131K tokens
- Architecture: Glm4MoeForCausalLM
- Precision: BF16
- Weights size: 716.7 GB
- Significance: major
- Published: 2025-07-20
- Last verified: 2026-06-17
- Hugging Face: https://huggingface.co/zai-org/GLM-4.5
- Canonical URL: https://theopenweights.com/news/glm-4-5-6wo9

Z.ai has introduced GLM-4.5, a powerful new open-source model designed for complex reasoning and agentic tasks. The model utilizes a Mixture-of-Experts (MoE) architecture with a total of 355 billion parameters, placing it firmly in the top tier of openly available large language models.

The most significant aspect of this release may be its license. GLM-4.5 is available under the permissive [MIT license](https://huggingface.co/zai-org/GLM-4.5), a notable decision that removes the commercial use restrictions often seen with other flagship-class model releases. This choice allows developers and businesses to freely build and deploy applications on a state-of-the-art foundation.

## Beyond Text Generation

Beyond its scale, GLM-4.5 is explicitly engineered for more than simple text completion. The model's architecture is optimized for hybrid reasoning, enabling it to function as the core of an autonomous agent that can understand user intent and execute multi-step tasks. Key capabilities include:

*   Interacting with external tools and APIs.
*   Planning and executing complex workflows.
*   Performing sophisticated data analysis.

With a context length of 131,072 tokens, the model can process and reason over extensive documents. Developers can access the model weights and documentation on the official Hugging Face repository.

## Get the model

- [Hugging Face](https://huggingface.co/zai-org/GLM-4.5)

## Sources

- [zai-org/GLM-4.5](https://huggingface.co/zai-org/GLM-4.5) — Hugging Face, Jul 20, 2025

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Source: The Open Weights (https://theopenweights.com/). Aggregated and written by Claude, curated by humans. Cite as: "Z.ai Releases 355B Parameter GLM-4.5 Under MIT License", The Open Weights, Jul 20, 2025, https://theopenweights.com/news/glm-4-5-6wo9