How do I use GLM 5.3 FlashX 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 5.3 FlashX

Access GLM 5.3 FlashX through one API key. Z.ai GLM 5.3 Flash at 200 tok/s.

GLM 5.3 FlashX is the high-speed variant of Z.ai's GLM 5.3 Flash, a native multimodal model delivering inference speeds of up to 200 tokens per second on the same hybrid sparse and linear attention architecture. FlashX is for interactive experiences on top of GLM 5.3 Flash — live coding assistants, chat — where 200 tokens per second changes how the product feels.

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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 5.3 FlashX respond in real time.

POST/v1/ai/chatz-ai/glm-5.3-flashx

Message *

Max Tokens

Maximum tokens in the response.

Stream

Real-time tokens

Hit "Send Request" to see the response

Context Window

1.0M tokens

Max Output

131K tokens

Input Price

$0.55 / 1M tokens

Output Price

$1.85 / 1M tokens

Strengths

✓

Up to 200 tokens/s

The fast-serving edition of GLM 5.3 Flash.

✓

Native multimodal

Accepts text, images and video.

✓

1M context, 131K output

Handles up to 1,048,576 input tokens and returns up to 131,072 output tokens per call.

✓

Low cost for the speed

$0.58 per 1M input and $1.85 per 1M output tokens.

Quick start

Copy this snippet and start making calls with GLM 5.3 FlashX.

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-5.3-flashx",
    "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 5.3 FlashX 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 5.3 FlashX API — pricing, context window & access

GLM 5.3 FlashX is the high-speed variant of Z.ai's GLM 5.3 Flash, a native multimodal model delivering inference speeds of up to 200 tokens per second on the same hybrid sparse and linear attention architecture. It pairs a 1,048,576-token context window with up to 131,072 output tokens per response, at $0.58 per 1M input and $1.85 per 1M output tokens through YepAPI.

Through YepAPI you call GLM 5.3 FlashX on an OpenAI-compatible endpoint with a single key — the same key that reaches GPT-6, Claude, Gemini, Grok and the SEO, SERP and scraping APIs. Input: text, images, video.

What is GLM 5.3 FlashX?

GLM 5.3 FlashX is the high-speed variant of Z.ai's GLM 5.3 Flash, a native multimodal model delivering inference speeds of up to 200 tokens per second on the same hybrid sparse and linear attention architecture. It accepts text, image and video with a 1,048,576-token context window and up to 131,072 output tokens at $0.58 / $1.85 per 1M tokens. It accepts text, images, video as input, handles up to 1,048,576 tokens of context and returns up to 131,072 output tokens per call.

Build with GLM 5.3 FlashX via YepAPI

YepAPI serves GLM 5.3 FlashX on the OpenAI-compatible /v1/ai/chat endpoint. Point your base URL at YepAPI, add your key, and set the model string to glm-5.3-flashx (or the full z-ai/glm-5.3-flashx). Function calling, structured outputs and reasoning settings pass straight through, and switching to any other model on the platform is a one-string change per request.

GLM 5.3 FlashX API pricing — $0.58 / 1M input, $1.85 / 1M output

GLM 5.3 FlashX costs $0.58 per 1M input tokens and $1.85 per 1M output tokens through YepAPI, pay per token with no minimums. Failed calls are never charged, and every request is itemised in your dashboard API Logs so you can see exactly what a 131,072-token response cost.

GLM 5.3 FlashX use cases

FlashX is for interactive experiences on top of GLM 5.3 Flash — live coding assistants, chat — where 200 tokens per second changes how the product feels.

Try GLM 5.3 FlashX free

Every new YepAPI account includes $5 in free credit with no card required — enough to test GLM 5.3 FlashX on your own prompts before committing to paid usage. Create an account, copy your key, and call glm-5.3-flashx right away.