How do I use GLM 5.3 Flash 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 Flash

Access GLM 5.3 Flash through one API key. Z.ai Cheapest Multimodal GLM.

GLM 5.3 Flash is a native multimodal model from Z.ai suited for efficient coding and long-horizon agent tasks. Flash is for high-volume agents and coding tasks that also need to look at screenshots or video, at close to the lowest price on the platform.

Full Docs Get API Key — Free $5 Credit

No credit card required. Takes 30 seconds.

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 Flash respond in real time.

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

Message *

Max Tokens

Maximum tokens in the response.

Stream

Real-time tokens

Hit "Send Request" to see the response

Context Window

1.3M tokens

Max Output

131K tokens

Input Price

$0.06 / 1M tokens

Output Price

$0.74 / 1M tokens

Strengths

✓

Near-zero cost

$0.06 per 1M input and $0.74 per 1M output tokens.

✓

Native multimodal

Accepts text, images and video.

✓

1.3M context

Handles up to 1,310,720 input tokens and returns up to 131,072 output tokens per call.

✓

Hybrid attention

Sparse plus linear attention keeps long-context accuracy at low cost.

Quick start

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

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-flash",
    "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 Flash 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 Flash API — pricing, context window & access

GLM 5.3 Flash is a native multimodal model from Z.ai suited for efficient coding and long-horizon agent tasks. It pairs a 1,310,720-token context window with up to 131,072 output tokens per response, at $0.06 per 1M input and $0.74 per 1M output tokens through YepAPI.

Through YepAPI you call GLM 5.3 Flash 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 Flash?

GLM 5.3 Flash is a native multimodal model from Z.ai suited for efficient coding and long-horizon agent tasks. Its hybrid sparse and linear attention architecture keeps long-context behaviour accurate while cutting cost to $0.06 / $0.74 per 1M tokens, with text, image and video input, a 1,310,720-token context window and up to 131,072 output tokens. It accepts text, images, video as input, handles up to 1,310,720 tokens of context and returns up to 131,072 output tokens per call.

Build with GLM 5.3 Flash via YepAPI

YepAPI serves GLM 5.3 Flash 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-flash (or the full z-ai/glm-5.3-flash). 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 Flash API pricing — $0.06 / 1M input, $0.74 / 1M output

GLM 5.3 Flash costs $0.06 per 1M input tokens and $0.74 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 Flash use cases

Flash is for high-volume agents and coding tasks that also need to look at screenshots or video, at close to the lowest price on the platform.

Try GLM 5.3 Flash free

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