Anthropic

Anthropic ↗ helps build reliable, interpretable, and steerable AI systems.

Endpoint

Base URL

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

Examples

cURL

With API Key in Request

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?"}
    ]
  }'

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

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

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,
});

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

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. Send your requests to:

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

Specify:


{
	"model": "anthropic/{model}"
}