ZAI GLM Chat API

Overview

ZAI’s GLM chat models on RouterBase, served through the standard OpenAI-compatible chat completions endpoint with streaming and tool calling. Covers the GLM-4.5, GLM-4.6, GLM-4.7, and GLM-5 families, including the vision-capable GLM-4.5V / GLM-4.6V.


Provider	ZAI
Families	`glm-4.5`, `glm-4.6`, `glm-4.7`, `glm-5`
Modality	Chat
Input	Text (image on `*V` models)
Output	Text

Models

zai/glm-5.2
zai/glm-5.1
zai/glm-5
zai/glm-4.7
zai/glm-4.6
zai/glm-4.6v
zai/glm-4.5
zai/glm-4.5v
zai/glm-4.5-air

Pricing is deliberately not reproduced here. Rates are set per model in the RouterBase catalogue and can be overridden per account, so any figure copied into this page is a snapshot that goes stale the next time a rate changes. Fetch the current rate for any model from the Models API:

GET /api/models/{model}/pricing

URL-encode the slash in the model id — e.g. zai%2Fglm-5.2.

Endpoint

POST https://routerbase.com/v1/chat/completions

Drop-in compatible with the OpenAI Chat Completions API — point your existing OpenAI client at https://routerbase.com/v1 with your RouterBase key. See the full Chat Completions reference for every supported parameter.

Quickstart

curl https://routerbase.com/v1/chat/completions \
  -H "Authorization: Bearer $ROUTERBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "zai/glm-4.6",
    "messages": [
      { "role": "user", "content": "Explain mixture-of-experts in one sentence." }
    ]
  }'

from openai import OpenAI

client = OpenAI(
    base_url="https://routerbase.com/v1",
    api_key="$ROUTERBASE_API_KEY",
)

resp = client.chat.completions.create(
    model="zai/glm-5",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)

Set "stream": true for token streaming (Server-Sent Events), exactly like the OpenAI API. Swap model for any id from the table above.

Vision input (GLM-4.5V / GLM-4.6V)

The *V models accept images alongside text using the standard OpenAI content-parts format:

{
  "model": "zai/glm-4.6v",
  "messages": [
    { "role": "user", "content": [
      { "type": "text", "text": "What's in this image?" },
      { "type": "image_url", "image_url": { "url": "https://example.com/cat.jpg" } }
    ]}
  ]
}

Get Started

API Reference

Overview

Models

Endpoint

Quickstart

Vision input (GLM-4.5V / GLM-4.6V)

​Overview

​Models

​Endpoint

​Quickstart

​Vision input (GLM-4.5V / GLM-4.6V)

Overview

Models

Endpoint

Quickstart

Vision input (GLM-4.5V / GLM-4.6V)