Z.ai/v1/ai/z-ai/glm-5.1

GLM 5.1

Access GLM 5.1 through one API key. Zhipu AI's latest bilingual model.

Zhipu AI's latest model. Strong bilingual reasoning and generation with 131K output tokens.

Full Docs Get API Key

Context Window

203K tokens

Max Output

131K tokens

Input Price

$1.26 / 1M tokens

Output Price

$3.96 / 1M tokens

Try it live

Send a message and see GLM 5.1 respond in real time.

POST /v1/ai/z-ai/glm-5.1Live testing

API Key

Message *

Max Tokens

Maximum tokens in the response.

Stream

Real-time token streaming

Hit "Run" to see the response

Strengths

✓Latest GLM

✓Bilingual CN/EN

✓131K output

✓Strong reasoning

Quick start

Copy this snippet and start making calls with GLM 5.1.

const res = await fetch('https://api.yepapi.com/v1/ai/z-ai/glm-5.1', {
  method: 'POST',
  headers: {
    'x-api-key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "messages": [
      {
        "role": "user",
        "content": "Explain API gateways in 2 sentences."
      }
    ],
    "maxTokens": 256
  }),
});
const data = await res.json();
console.log(data);

Why use GLM 5.1 through YepAPI?

✓One API key for all models — no separate accounts

✓OpenAI SDK compatible — just change the base URL

✓No monthly minimums — pay per token

✓Switch models with one line of code

✓Full provider passthrough — citations, search results, and all extras included

✓Streaming and non-streaming support on every model

✓Works with Cursor, Claude, LangChain, and any LLM tool

✓Unified billing across all providers

Frequently asked questions

Zhipu AI's latest model. Strong bilingual reasoning and generation with 131K output tokens.

Input tokens cost $1.26 per 1M tokens and output tokens cost $3.96 per 1M tokens through YepAPI. No monthly minimums — you only pay for what you use.

Sign up for a free API key, then send requests to the /v1/ai/z-ai/glm-5.1 endpoint. YepAPI is OpenAI SDK compatible, so you can use it with any tool that supports OpenAI — just change the base URL.

GLM 5.1 supports a 203K token context window with up to 131K output tokens per request.