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GLM-5.1

GLM
by Z.ai

GLM-5.1 is a flagship LLM for agentic workflows, coding, and long-horizon reasoning tasks.

Try in Chat
Free EndpointDownloadableApr 17, 2026open license28M API calls / 30d

Specifications

Context Length
131K
131,072 tokens
Input Price
Free
per 1M tokens
Output Price
Free
per 1M tokens
Modalities
1
text→text

Capabilities

text generationchatcodereasoningagenticfunction calling

Tags

agentic-aicodingreasoning

API Usage

1Router is fully OpenAI-compatible. Just set the base URL and use this model ID:

z-ai/glm-5.1
cURL
curl https://api.1router.com/v1/chat/completions \
  -H "Authorization: Bearer $ROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "z-ai/glm-5.1",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'