Z.ai API (GLM Flash models)

by docs.z.ai

AI models and chat Added on November 1st, 2026

What it does

The Z.ai API gives access to the GLM language models from Zhipu AI for chat, text generation, coding and image understanding. It uses the OpenAI format, so the OpenAI SDKs work after changing the base URL to api.z.ai. Requests are JSON POST calls to the chat completions endpoint, with streaming as an option. The larger GLM models are paid per token. Free with a free API key for the Flash models: GLM-4.7-Flash, GLM-4.5-Flash and GLM-4.6V-Flash.

API
JSON
REST

At a glance

API key: Needed, free · More APIs with a free key
Pricing: Free with a free API key for the Flash models: GLM-4.7-Flash, GLM-4.5-Flash and GLM-4.6V-Flash.
From the browser: Yes (CORS)
Formats: JSON
Interface: REST
Provider: docs.z.ai

More information: https://docs.z.ai/guides/overview/pricing

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HTML

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Markdown

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Example request

curl

curl -X POST 'https://api.z.ai/api/paas/v4/chat/completions' \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"model": "glm-4.7-flash", "messages": [{"role": "user", "content": "hello"}]}'

JavaScript

const response = await fetch("https://api.z.ai/api/paas/v4/chat/completions", {
  method: 'POST',
  headers: {
    "Authorization": "Bearer YOUR_API_KEY",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({"model":"glm-4.7-flash","messages":[{"role":"user","content":"hello"}]}),
});
const data = await response.json();
console.log(data);

Python

import requests

response = requests.post(
    "https://api.z.ai/api/paas/v4/chat/completions",
    headers={
        "Authorization": "Bearer YOUR_API_KEY",
        "Content-Type": "application/json",
    },
    json={
        "model": "glm-4.7-flash",
        "messages": [
            {
                "role": "user",
                "content": "hello",
            },
        ],
    },
    timeout=30,
)
print(response.json())

Replace YOUR_API_KEY with your own key. The JavaScript works in a web page as well as in Node.js 18 or newer.