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Z.ai

GLM 5.3 Flash

Name: GLM 5.3 Flash
Brand: Z.ai
Price: 0.15 USD
Availability: InStock

Popular

GLM 5.3 Flash is a reasoning model by Z.ai with vision, function calling, structured output — designed for complex, multi-step problem solving where accuracy matters more than speed. It supports a 131K token context window with up to 131K tokens of output. Priced at $0.15 per million input tokens and $0.5 per million output tokens, it is one of the most cost-efficient options in its class. Access GLM 5.3 Flash through Inworld Router with OpenAI SDK compatibility, built-in failover, and intelligent routing across providers.

→Function CallingReasoningResponse SchemaVisionreasoningCapabilityresponseFormatCapability

Use This Model

Step 1 — Create Router

curl --location 'https://api.inworld.ai/router/v1/routers' \
--header 'Authorization: Basic <your-api-key>' \
--header 'Content-Type: application/json' \
--data '{
  "name": "compare-frontier-models",
  "defaultRoute": {
    "route_id": "default",
    "variants": [
      {
        "variant": {
          "variant_id": "inworld/models/GLM-5.3-Flash-a",
          "model_id": "inworld/models/GLM-5.3-Flash"
        },
        "weight": 33
      },
      {
        "variant": {
          "variant_id": "inworld/models/GLM-5.2-b",
          "model_id": "inworld/models/GLM-5.2"
        },
        "weight": 33
      },
      {
        "variant": {
          "variant_id": "inworld/models/GLM-5.3-c",
          "model_id": "inworld/models/GLM-5.3"
        },
        "weight": 34
      }
    ]
  }
}'

import requests

response = requests.post(
    "https://api.inworld.ai/router/v1/routers",
    headers={
        "Authorization": "Basic <your-api-key>",
        "Content-Type": "application/json",
    },
    json={
        "name": "compare-frontier-models",
        "defaultRoute": {
            "route_id": "default",
            "variants": [
                {
                    "variant": {
                        "variant_id": "inworld/models/GLM-5.3-Flash-a",
                        "model_id": "inworld/models/GLM-5.3-Flash"
                    },
                    "weight": 33
                },
                {
                    "variant": {
                        "variant_id": "inworld/models/GLM-5.2-b",
                        "model_id": "inworld/models/GLM-5.2"
                    },
                    "weight": 33
                },
                {
                    "variant": {
                        "variant_id": "inworld/models/GLM-5.3-c",
                        "model_id": "inworld/models/GLM-5.3"
                    },
                    "weight": 34
                }
            ]
        }
    },
)
print(response.json())

const response = await fetch(
  "https://api.inworld.ai/router/v1/routers",
  {
    method: "POST",
    headers: {
      Authorization: "Basic <your-api-key>",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      name: "compare-frontier-models",
      defaultRoute: {
        route_id: "default",
        variants: [
          {
            variant: {
              variant_id: "inworld/models/GLM-5.3-Flash-a",
              model_id: "inworld/models/GLM-5.3-Flash",
            },
            weight: 33,
          },
          {
            variant: {
              variant_id: "inworld/models/GLM-5.2-b",
              model_id: "inworld/models/GLM-5.2",
            },
            weight: 33,
          },
          {
            variant: {
              variant_id: "inworld/models/GLM-5.3-c",
              model_id: "inworld/models/GLM-5.3",
            },
            weight: 34,
          },
        ],
      },
    }),
  }
);
const data = await response.json();
console.log(data);

Step 2 — Chat Completion

curl --location 'https://api.inworld.ai/v1/chat/completions' \
--header 'Authorization: Basic <your-api-key>' \
--header 'Content-Type: application/json' \
--data '{
  "model": "inworld/compare-frontier-models",
  "messages": [{"role": "user", "content": "Hello!"}]
}'

GLM 5.3 Flash pricing and providers

Access GLM 5.3 Flash through Inworld via Inworld Router or Realtime API. By using the AI provider(s) below you acknowledge you reviewed and agree to their terms listed in the Legal section under the AI provider's name.