For AI agents: the complete documentation index is available at https://aioproxy.dev/llms.txt, the full documentation bundle is available at https://aioproxy.dev/llms-full.txt, and this page is available as Markdown at https://aioproxy.dev/guide/providers/api/anthropic.md.
AIO Proxy
  • English

      • Anthropic Messages Protocol (anthropic)

      The anthropic protocol connects to Anthropic's native /v1/messages endpoint.

      config.jsonc
      {
  "providers": {
    "anthropic-direct": {
      "kind": "api",
      "protocol": "anthropic",
      "baseURL": "https://api.anthropic.com/v1",
      "apiKey": "{{env.ANTHROPIC_API_KEY}}",
      "models": ["claude-3-7-sonnet-20250219", "claude-3-5-haiku-20241022"],
    },
  },
}

      Features

      • Native support for Anthropic headers (anthropic-version, anthropic-beta).
      • Seamless translation for tools, thought blocks, and cache markers (cache_control).