---
title: Anthropic
description: Route Anthropic API requests through AI Gateway for observability and control.
image: https://edgetunnel-b2h.pages.dev/dev-products-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://edgetunnel-b2h.pages.dev/ai-gateway/llms.txt  
> Use this file to discover all available pages before exploring further. 

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# Anthropic

[Anthropic ↗](https://www.anthropic.com/) helps build reliable, interpretable, and steerable AI systems.

## Endpoint

**Base URL**

```txt
https://gateway.ai.cloudflare.com/v1/{account_id}/{gateway_id}/anthropic
```

## Examples

### cURL

With API Key in Request

* [ With Authenticated Gateway ](#tab-panel-7162)
* [ Unauthenticated Gateway ](#tab-panel-7163)

```bash
curl https://gateway.ai.cloudflare.com/v1/{account_id}/{gateway_id}/anthropic/v1/messages \
 --header 'x-api-key: {anthropic_api_key}' \
 --header 'cf-aig-authorization: Bearer {CF_AIG_TOKEN}' \
 --header 'anthropic-version: 2023-06-01' \
 --header 'Content-Type: application/json' \
 --data  '{
    "model": "claude-sonnet-4-5",
    "max_tokens": 1024,
    "messages": [
      {"role": "user", "content": "What is Cloudflare?"}
    ]
  }'
```

```bash
curl https://gateway.ai.cloudflare.com/v1/{account_id}/{gateway_id}/anthropic/v1/messages \
 --header 'x-api-key: {anthropic_api_key}' \
 --header 'anthropic-version: 2023-06-01' \
 --header 'Content-Type: application/json' \
 --data  '{
    "model": "claude-sonnet-4-5",
    "max_tokens": 1024,
    "messages": [
      {"role": "user", "content": "What is Cloudflare?"}
    ]
  }'
```

With Stored Keys (BYOK) / Unified Billing

```bash
curl https://gateway.ai.cloudflare.com/v1/{account_id}/{gateway_id}/anthropic/v1/messages \
 --header 'cf-aig-authorization: Bearer {CF_AIG_TOKEN}' \
 --header 'anthropic-version: 2023-06-01' \
 --header 'Content-Type: application/json' \
 --data  '{
    "model": "claude-sonnet-4-5",
    "max_tokens": 1024,
    "messages": [
      {"role": "user", "content": "What is Cloudflare?"}
    ]
  }'
```

### Anthropic SDK

With Key in Request

* [ With Authenticated Gateway ](#tab-panel-7164)
* [ Unauthenticated Gateway ](#tab-panel-7165)

```js
import Anthropic from "@anthropic-ai/sdk";


const baseURL = `https://gateway.ai.cloudflare.com/v1/{accountId}/{gatewayId}/anthropic`;


const anthropic = new Anthropic({
  apiKey: "{ANTHROPIC_API_KEY}",
  baseURL,
  defaultHeaders: {
    Authorization: `Bearer {cf_api_token}`,
  },
});


const message = await anthropic.messages.create({
  model: "claude-sonnet-4-5",
  messages: [{ role: "user", content: "What is Cloudflare?" }],
  max_tokens: 1024,
});
```

```js
import Anthropic from "@anthropic-ai/sdk";


const baseURL = `https://gateway.ai.cloudflare.com/v1/{accountId}/{gatewayId}/anthropic`;


const anthropic = new Anthropic({
  apiKey: "{ANTHROPIC_API_KEY}",
  baseURL,
});


const message = await anthropic.messages.create({
  model: "claude-sonnet-4-5",
  messages: [{ role: "user", content: "What is Cloudflare?" }],
  max_tokens: 1024,
});
```

With Stored Keys (BYOK) / Unified Billing

```js
import Anthropic from "@anthropic-ai/sdk";


const baseURL = `https://gateway.ai.cloudflare.com/v1/{accountId}/{gatewayId}/anthropic`;


const anthropic = new Anthropic({
  baseURL,
  defaultHeaders: {
    Authorization: `Bearer {cf_api_token}`,
  },
});


const message = await anthropic.messages.create({
  model: "claude-sonnet-4-5",
  messages: [{ role: "user", content: "What is Cloudflare?" }],
  max_tokens: 1024,
});
```

## OpenAI-Compatible Endpoint

You can also access Anthropic models using the OpenAI API schema through the [REST API](https://edgetunnel-b2h.pages.dev/ai-gateway/usage/rest-api/). Send your requests to:

```txt
https://api.cloudflare.com/client/v4/accounts/{account_id}/ai/v1/chat/completions
```

Specify:

```json
{
  "model": "anthropic/{model}"
}
```

```json
{"@context":"https://schema.org","@type":"TechArticle","@id":"https://edgetunnel-b2h.pages.dev/ai-gateway/usage/providers/anthropic/#page","headline":"Anthropic · Cloudflare AI Gateway docs","description":"Route Anthropic API requests through AI Gateway for observability and control.","url":"https://edgetunnel-b2h.pages.dev/ai-gateway/usage/providers/anthropic/","inLanguage":"en","image":"https://edgetunnel-b2h.pages.dev/dev-products-preview.png","dateModified":"2026-04-20","publisher":{"@type":"Organization","name":"Cloudflare","url":"https://www.cloudflare.com/"},"isPartOf":{"@type":"WebSite","@id":"https://edgetunnel-b2h.pages.dev/#website","name":"Cloudflare Docs","url":"https://edgetunnel-b2h.pages.dev/"}}
{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/directory/","name":"Directory"}},{"@type":"ListItem","position":2,"item":{"@id":"/ai-gateway/","name":"AI Gateway"}},{"@type":"ListItem","position":3,"item":{"@id":"/ai-gateway/usage/","name":"Using AI Gateway"}},{"@type":"ListItem","position":4,"item":{"@id":"/ai-gateway/usage/providers/","name":"Provider Native"}},{"@type":"ListItem","position":5,"item":{"@id":"/ai-gateway/usage/providers/anthropic/","name":"Anthropic"}}]}
```