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Available now on ModelsLab · Language Model

Z.ai: GLM 5.1Autonomous Tasks, 8 Hours

Try Z.ai: GLM 5.1API Documentation

Deploy GLM 5.1 Power

Long-Horizon

Sustained Execution

Handles single tasks autonomously up to 8 hours from planning to production.

Coding Strength

Agentic Engineering

Matches Claude Opus 4.6 in coding and general capabilities with 200K context.

Deep Reasoning

Enable Thinking Mode

Activates compulsory reasoning for complex tasks via thinking parameter.

Examples

See what Z.ai: GLM 5.1 can create

Copy any prompt below and try it yourself in the playground.

Code Refactor

“Refactor this Python function for better performance and add error handling: def process_data(data): return sum(data)”

Tech Docs

“Write technical documentation for a REST API endpoint that handles user authentication with JWT tokens.”

System Design

“Design a scalable microservices architecture for an e-commerce platform including database schema.”

Debug Script

“Debug this bash script that fails on large files and optimize it: for file in *.log; do grep error $file > output.txt; done”

For Developers

A few lines of code.
GLM 5.1. One Call.

ModelsLab handles the infrastructure: fast inference, auto-scaling, and a developer-friendly API. No GPU management needed.

  • Serverless: scales to zero, scales to millions
  • Pay per token, no minimums
  • Python and JavaScript SDKs, plus REST API
API Documentation 
import requests


response = requests.post(
    "https://modelslab.com/api/v7/llm/chat/completions",
    json={
  "key": "YOUR_API_KEY",
  "prompt": "",
  "model_id": ""
}
)
print(response.json())

FAQ

Common questions about Z.ai: GLM 5.1

Read the docs

Z.ai: GLM 5.1 is the flagship LLM for long-horizon tasks. It executes autonomously up to 8 hours. Matches Claude Opus 4.6 in coding.

Set model to glm-5.1 in chat completions endpoint. Use Bearer token auth at api.z.ai/api/paas/v4. Supports 200K context, 128K output.

Yes, excels in agentic engineering and real-world coding. Outperforms GPT-5.4 in sustained execution benchmarks.

Direct alternative with aligned capabilities. Use for complex reasoning via thinking enabled. Migrate by updating model ID.

200K token context window. 131K max tokens output. Enable stream and tool_stream for real-time handling.

Costs deducted at 1x quota off-peak, higher peak. Check Z.ai dashboard for API key usage. Free tier available.

Ready to create?

Start generating with Z.ai: GLM 5.1 on ModelsLab.

Try Z.ai: GLM 5.1API Documentation