xAI

Grok 4.20

Grok 4.20 is a reasoning model by xAI with vision, function calling, structured output — designed for complex, multi-step problem solving where accuracy matters more than speed. It features an extended 2M token context window, suitable for processing long documents and complex conversations. Priced at $1.25 per million input tokens and $2.5 per million output tokens. Access Grok 4.20 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": "xai/grok-4.20-a",
          "model_id": "xai/grok-4.20"
        },
        "weight": 33
      },
      {
        "variant": {
          "variant_id": "xai/grok-4.20-non-reasoning-b",
          "model_id": "xai/grok-4.20-non-reasoning"
        },
        "weight": 33
      },
      {
        "variant": {
          "variant_id": "xai/grok-4.20-c",
          "model_id": "xai/grok-4.20"
        },
        "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": "xai/grok-4.20-a",
                        "model_id": "xai/grok-4.20"
                    },
                    "weight": 33
                },
                {
                    "variant": {
                        "variant_id": "xai/grok-4.20-non-reasoning-b",
                        "model_id": "xai/grok-4.20-non-reasoning"
                    },
                    "weight": 33
                },
                {
                    "variant": {
                        "variant_id": "xai/grok-4.20-c",
                        "model_id": "xai/grok-4.20"
                    },
                    "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: "xai/grok-4.20-a",
              model_id: "xai/grok-4.20",
            },
            weight: 33,
          },
          {
            variant: {
              variant_id: "xai/grok-4.20-non-reasoning-b",
              model_id: "xai/grok-4.20-non-reasoning",
            },
            weight: 33,
          },
          {
            variant: {
              variant_id: "xai/grok-4.20-c",
              model_id: "xai/grok-4.20",
            },
            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!"}]
}'

Grok 4.20 pricing and providers

Access Grok 4.20 through xAI 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.