Anthropic

Claude Opus 4.5 20251101

Name: Claude Opus 4.5 20251101
Brand: Anthropic
Price: 5 USD
Availability: InStock

Claude Opus 4.5 20251101 is a reasoning model by Anthropic with vision, function calling, prompt caching, structured output — designed for complex, multi-step problem solving where accuracy matters more than speed. It supports a 200K token context window with up to 64K tokens of output. Priced at $5 per million input tokens and $25 per million output tokens. Access Claude Opus 4.5 20251101 through Inworld Router with OpenAI SDK compatibility, built-in failover, and intelligent routing across providers.

→Function CallingReasoningPrompt CachingResponse SchemaVision

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": "anthropic/claude-opus-4-5-20251101-a",
          "model_id": "anthropic/claude-opus-4-5-20251101"
        },
        "weight": 33
      },
      {
        "variant": {
          "variant_id": "anthropic/claude-3-haiku-20240307-b",
          "model_id": "anthropic/claude-3-haiku-20240307"
        },
        "weight": 33
      },
      {
        "variant": {
          "variant_id": "anthropic/claude-haiku-4-5-20251001-c",
          "model_id": "anthropic/claude-haiku-4-5-20251001"
        },
        "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": "anthropic/claude-opus-4-5-20251101-a",
                        "model_id": "anthropic/claude-opus-4-5-20251101"
                    },
                    "weight": 33
                },
                {
                    "variant": {
                        "variant_id": "anthropic/claude-3-haiku-20240307-b",
                        "model_id": "anthropic/claude-3-haiku-20240307"
                    },
                    "weight": 33
                },
                {
                    "variant": {
                        "variant_id": "anthropic/claude-haiku-4-5-20251001-c",
                        "model_id": "anthropic/claude-haiku-4-5-20251001"
                    },
                    "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: "anthropic/claude-opus-4-5-20251101-a",
              model_id: "anthropic/claude-opus-4-5-20251101",
            },
            weight: 33,
          },
          {
            variant: {
              variant_id: "anthropic/claude-3-haiku-20240307-b",
              model_id: "anthropic/claude-3-haiku-20240307",
            },
            weight: 33,
          },
          {
            variant: {
              variant_id: "anthropic/claude-haiku-4-5-20251001-c",
              model_id: "anthropic/claude-haiku-4-5-20251001",
            },
            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!"}]
}'

Claude Opus 4.5 20251101 pricing and providers

Access Claude Opus 4.5 20251101 through Anthropic via Inworld Router or Realtime API.

					Capabilities	Input modalities	Output modalities
Anthropic	200K	64K	$5.00	$25.00	+2

Other Anthropic models available through Inworld

Compare Claude Opus 4.5 20251101 with other Anthropic models available through Inworld Router or Realtime API.

					Capabilities
Claude 3 Haiku 20240307	200K	4.1K	$0.25	$1.25	+1
Claude Haiku 4.5 20251001	200K	64K	$1.00	$5.00	+2
Claude Opus 4 20250514	200K	32K	$15.00	$75.00	+2
Claude Opus 4.1 20250805	200K	32K	$15.00	$75.00	+2
Claude Opus 4.6	1M	128K	$5.00	$25.00	+2
Claude Sonnet 4 20250514	1M	64K	$3.00	$15.00	+2
Claude Sonnet 4.5 20250929	200K	64K	$3.00	$15.00	+3
Claude Sonnet 4.6	1M	64K	$3.00	$15.00	+2

Start building with Claude Opus 4.5 20251101

Access Claude Opus 4.5 20251101 and every other model through Inworld Router or Realtime API. Create your free account and start routing in minutes.

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