zai-org/GLM-5.1 API
About
Build advanced reasoning agents with zai-org/GLM-5.1, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $1.40/1M input and $4.40/1M output tokens, native tool calling support, open weights architecture. Access zai-org/GLM-5.1 via the SiliconFlow API with up to 205K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsOpen
Limits
Context Window
205K
Tokens
Input Limit
205K
Tokens
Max Output
205K
Tokens
Pricing
Standard (per 1M tokens)
Input
$1.40
Output
$4.40
Caching (per 1M tokens)
Write
Free
Frequently Asked Questions
zai-org/GLM-5.1 by SiliconFlow costs $1.40 per 1M input tokens and $4.40 per 1M output tokens. Cache writes cost Free per 1M tokens.
Model Details
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
SILICONFLOW_API_KEY
API Base URL
https://api.siliconflow.com/v1