How do I use GLM 5.1 through YepAPI?

Sign up for a free API key, then send requests to the /v1/ai/chat endpoint.

Z.aiText Generation/v1/ai/chat

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.

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2,400+

Developers

1.2M+

API calls served

100+

Endpoints

$0.01

Per call

Yep, that's it.

Try it live

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

POST/v1/ai/chatz-ai/glm-5.1

Message *

Max Tokens

Maximum tokens in the response.

Stream

Real-time tokens

Hit "Send Request" to see the response

Context Window

203K tokens

Max Output

131K tokens

Input Price

$1.76 / 1M tokens

Output Price

$5.54 / 1M tokens

Strengths

✓

Latest GLM

GLM 5.1 is one of Zhipu AI's newest models, carrying current-generation reasoning and generation quality across the GLM line.

✓

Bilingual CN/EN

Built by a Chinese lab, it delivers strong Chinese and English performance, well suited to cross-language reasoning and content.

✓

131K output

A 131,072-token maximum output lets GLM 5.1 generate very long documents and reports in a single response.

✓

Strong reasoning

With a 202,752-token context window, it sustains multi-step reasoning over large inputs across analytical and coding tasks.

Quick start

Copy this snippet and start making calls with GLM 5.1.

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

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

GLM 5.1 API: Zhipu AI's bilingual model with 131K output

GLM 5.1 is one of Zhipu AI's latest models, combining strong bilingual Chinese-English reasoning with a very large 131,072-token output ceiling.

On YepAPI you call GLM 5.1 through one OpenAI-compatible endpoint at $1.76 per 1M input and $5.54 per 1M output tokens, with a 202,752-token context window.

What is GLM 5.1?

GLM 5.1 is a current-generation model from Zhipu AI, the lab behind the GLM family. It pairs strong reasoning and generation with genuine bilingual Chinese-English ability, reflecting its Chinese research origins. The model carries a 202,752-token context window and an unusually large 131,072-token output ceiling, so it can both ingest substantial inputs and produce long, complete responses without truncation. GLM 5.1 sits just below the flagship GLM 5.2 in the lineup, offering capable reasoning and long-form generation in both languages, which makes it a versatile choice for analytical and content tasks that span Chinese and English contexts.

Build with GLM 5.1 via YepAPI

Call GLM 5.1 through YepAPI's OpenAI-compatible /v1/ai/chat endpoint. Point your OpenAI SDK at YepAPI and set the model string to glm; switching to another model later is a single-string change. One YepAPI key also covers every other model plus SEO, SERP, and web-scraping tools, so you can collect bilingual source material and have GLM 5.1 reason over it or draft long outputs from it within a single integration.

GLM 5.1 API pricing — $1.76 / $5.54 per 1M tokens

GLM 5.1 costs $1.76 per 1M input tokens and $5.54 per 1M output tokens on YepAPI. Given the 131K-token output ceiling, the output rate is the one to plan around: long generations consume many tokens. The pricing keeps GLM 5.1 below flagship GLM 5.2 while still offering strong bilingual reasoning, so it is a sensible middle tier when you want quality long-form output without paying for the top model.

GLM 5.1 for bilingual reasoning and long-form output

GLM 5.1 fits analytical and content work that spans Chinese and English: comparing markets and ecosystems, drafting long bilingual reports, reasoning over mixed-language documents, and producing detailed responses that need to run long. The 131,072-token output ceiling means it can complete extensive documents in one pass, and the 200K context keeps the source material in view. When both languages and output length matter, GLM 5.1 is a strong fit.

Try GLM 5.1 free

New YepAPI accounts include $5 of free credit with no card required. Use it to test GLM 5.1 on your bilingual reasoning and long-form generation tasks, and compare it against GLM 5.2 and other models before committing.