GLM-5.1

Best for

Teams evaluating open-weight models for tool-calling, software engineering, and agent systems.

Who should use it

• Teams evaluating open-weight models for tool-calling, software engineering, and agent systems.
• Teams with access to hosted inference or server-class deployment paths.
• Developers evaluating coding assistant, repo-editing, and code review workflows.
• Teams testing tool-use, agentic planning, and multi-step workflow behavior.

Common workflows

• Agentic engineering, coding, tool use, reasoning
• agents workflows
• coding workflows
• reasoning workflows
• tool-use workflows

Deployment and hardware notes

Full model is server-class; smaller Air or Flash style variants are usually better for local testing.

License and usage notes

Check model card. Open weights where released. Verify the exact model card and license terms for the checkpoint or hosted provider you use.

Strengths

• Open weights where released model option for GLM workflows.
• Teams evaluating open-weight models for tool-calling, software engineering, and agent systems.
• Tracked as Frontier 2026 in the OpenSourcesAI model directory.

Limitations

• Large model; production fit depends on serving support, license review, and current API/model availability.
• Full model is server-class; smaller Air or Flash style variants are usually better for local testing.
• Context window and limits: Check current Z.ai docs.
• Verify the exact model card, provider docs, license, and serving support before production use.

Frontier-model verification note

This page is written to stay accurate as of the latest available 2026 public model information. Availability, licenses, context windows, API support, pricing, benchmark standing, and local-serving support can change quickly. Verify the official model card, provider docs, and license before using this model in production or commercial workflows.

Sources to verify