# claude-opus-4-5-20251101 · API guide

Use the exact API model ID `claude-opus-4-5-20251101`. This guide describes the platform contract; check the live catalog before calling the model.


## Availability

This model is retired. This guide is retained for historical integrations. For new integrations, choose an active model with available supply in the live catalog.

An active catalog record means the model is configured; it does not guarantee an available channel. Before integration, check `lifecycle`, `health.status` and `contract` in `GET /v1/public-model-catalog`. Account pricing is shown in the dashboard. If supply is unavailable, wait for recovery or explicitly select another model. Do not repeatedly submit requests with an unknown outcome.

## Request example

The platform origin is filled in at build time. Set API_KEY to your server-side key before running.

```bash
curl "https://newrouters.com/v1/messages" \
  -H "Content-Type: application/json" \
  -H "x-api-key: $API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  --data '{
  "model": "claude-opus-4-5-20251101",
  "max_tokens": 1024,
  "messages": [
    {
      "role": "user",
      "content": "Explain how an HTTP request works in three concise steps."
    }
  ],
  "stream": false
}'
```

## Protocol and response

This model uses the claude protocol. Read its native response and usage fields; do not wrap the request in the media task input envelope.

Supported endpoint templates：

- `POST /v1/messages`
- `POST /v1/messages/count_tokens`

| Limit | Catalog value |
| --- | --- |
| Context tokens | 128000 |
| Maximum output tokens | 64000 |

For streaming, use the native protocol streaming option and parse its events; check supported capabilities in the live catalog.



<!-- official-reference:start -->
## Official sources and identity

Checked: 2026-10-14 · Platform model: `claude-opus-4-5-20251101` · Official reference: `claude-opus-4-5-20251101`

- [claude-opus-4-5-20251101 official reference](https://platform.claude.com/docs/en/models/opus-4-5/overview)
- [Anthropic Messages API](https://platform.claude.com/docs/en/api/messages/create)
- [Anthropic thinking and sampling rules](https://platform.claude.com/docs/en/build-with-claude/thinking)
<!-- official-reference:end -->

## Pricing and troubleshooting

Check current availability, contract and account pricing before integration. Keep request IDs and usage receipts when diagnosing errors. [Complete API reference](/docs/api)

## Request examples in other languages

### JavaScript

```javascript
const apiBaseUrl = "https://newrouters.com";
const apiKey = process.env.API_KEY;
if (!apiKey) throw new Error("Set API_KEY in your server environment");

const response = await fetch(apiBaseUrl + "/v1/messages", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "x-api-key": apiKey,
    "anthropic-version": "2023-06-01"
  },
  body: JSON.stringify({
  "model": "claude-opus-4-5-20251101",
  "max_tokens": 1024,
  "messages": [
    {
      "role": "user",
      "content": "Explain how an HTTP request works in three concise steps."
    }
  ],
  "stream": false
})
});

const result = await response.json();
if (!response.ok) throw new Error(JSON.stringify(result));
console.log(result);
```

### Python

```python
import json
import os
from urllib.request import Request, urlopen

api_base_url = "https://newrouters.com"
api_key = os.environ["API_KEY"]
body = json.loads("{\"model\":\"claude-opus-4-5-20251101\",\"max_tokens\":1024,\"messages\":[{\"role\":\"user\",\"content\":\"Explain how an HTTP request works in three concise steps.\"}],\"stream\":false}")

request = Request(
    api_base_url + "/v1/messages",
    data=json.dumps(body).encode("utf-8"),
    headers={
    "Content-Type": "application/json",
    "x-api-key": api_key,
    "anthropic-version": "2023-06-01"
    },
    method="POST",
)
with urlopen(request) as response:
    print(json.load(response))
```

## Response fields (illustrative values)

### HTTP 200

```json
{
  "content": [
    {
      "type": "text",
      "text": "..."
    }
  ],
  "stop_reason": "end_turn"
}
```