GLM 5.1
Z.AI
z-ai/glm-5.1GLM-5.1 is an incremental upgrade to Z.ai's GLM-5 flagship model, released as open source in April 2026 with improved reasoning and agentic performance. It continues GLM-5's focus on complex systems design and large-scale programming tasks.
Cost rate
0.7x
Context
205K
Released
Apr 7, 2026
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Output
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Support
ReasoningTool callingStructured outputs
Best at
The categories where this model ranks highest.