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Available now on ModelsLab · Language Model

Z.ai: GLM 5.1Autonomous Tasks, 8 Hours

Try GLM 5.1GLM 5 APIAPI 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, on plans from $21/month
  • 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",
  "messages": [
    {
      "role": "user",
      "content": "Write a Python function that retries an HTTP request with exponential backoff."
    }
  ],
  "model_id": "z-ai-glm-5.1"
}
)
print(response.json())

FAQ

Common questions about Z.ai: GLM 5.1

Read the docs

GLM 5.1 is Z.ai's flagship LLM for long-horizon coding and agent tasks; Z.ai reports it can work on one task for up to 8 hours. On ModelsLab you call it with model_id z-ai-glm-5.1 on the OpenAI-compatible chat completions endpoint.

POST to https://modelslab.com/api/v7/llm/chat/completions with "model": "z-ai-glm-5.1" and a messages array, and send your ModelsLab API key as a Bearer token. The endpoint is OpenAI-compatible, so the OpenAI SDK works with base_url https://modelslab.com/api/v7/llm.

Yes. Z.ai positions GLM 5.1 for agentic engineering and real-world coding and reports strong results on sustained-execution benchmarks. Test it on your own prompts before you move production traffic.

Often, for coding and agent workloads. The ModelsLab endpoint is OpenAI-compatible, so switching is a change to the model value; the rest of the request stays the same.

Z.ai lists a 200K-token context window and up to 131K output tokens. Set "stream": true on the ModelsLab endpoint to receive tokens as they are generated.

GLM 5.1 is listed at $2.00 per million tokens on its ModelsLab model page (checked 2026-09-23) and is billed per token. API access needs a ModelsLab plan from $21/month; there is no free tier.

The same endpoint serves GLM 5 (z-ai-glm-5, modelslab.com/zai-glm-5), GLM 4.7 (z-ai-glm-4.7, modelslab.com/zai-glm-47), GLM 4.7 Flash (z-ai-glm-4.7-flash, modelslab.com/zai-glm-47-flash), GLM 4.6V for vision (z-ai-glm-4.6v, modelslab.com/zai-glm-46v) and GLM 4.5 Air (z-ai-glm-4.5-air, modelslab.com/zai-glm-45-air), plus GLM 5.2 and 5.3. Switch between them by changing the model value.

Ready to create?

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

Try GLM 5.1GLM 5 APIAPI Documentation