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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
Terminal window
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?"}
    ]
  }'

With Stored Keys (BYOK) / Unified Billing
Terminal window
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,
});

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 use the OpenAI-compatible endpoint (/ai-gateway/usage/chat-completion/) to access Anthropic models using the OpenAI API schema. To do so, send your requests to:

https://gateway.ai.cloudflare.com/v1/{account_id}/{gateway_id}/compat/chat/completions

Specify:

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