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Z.ai
Released April 2026
GLM 5.1
Open weights, improved reasoning, agentic flows
Reasoning
Tool Use
About this model
GLM 5.1 is the latest iteration of Zhipu AI's open-weight reasoning model with improved benchmarks across coding, math, and tool-calling tasks. Suitable for cost-conscious deployments needing strong reasoning capabilities.
Context Window
202K
Input Cost
$1.26/M
Output Cost
$3.96/M
Input Types
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