Yes, you can use the model zai-org/GLM-5.3-Flash commercially. It is licensed under the MIT License, which is a permissive license allowing for commercial use without significant restrictions.

Key Details:

• License: MIT - This permits commercial usage, modification, distribution, and private use.
• Gated Access: No, it's freely accessible.
• Last Updated: The model has been updated as recently as August 27, 2026, indicating ongoing support.

Furthermore, the model has accumulated 346,516 downloads, suggesting it's been adopted significantly in the community. The active maintenance is supported by related repositories, such as the glm53flash-spark-recipe, which was pushed only a few days ago and is actively maintained.

In summary, you’re clear to utilize the GLM-5.3-Flash model in your commercial applications, but ensure compliance with the MIT License—mainly retaining the license notice in all copies or substantial portions of the software.