A4F

Documentation

Getting Started

Quickstart

A4F provides a unified API that gives you access to hundreds of AI models through a single endpoint. This allows you to switch between models and providers without changing your code, while automatically handling fallbacks and selecting the most cost-effective options. Get started with just a few lines of code using your preferred SDK or framework.

Using the OpenAI SDK

In the examples below, the A4F-specific headers are optional. Setting them allows your app to appear on the A4F leaderboards.

curl https://api.a4f.co/v1/chat/completions \
  -H "Authorization: Bearer YOUR_A4F_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "provider-1/chatgpt-4o-latest",
    "messages": [
      {"role": "user", "content": "What is the meaning of life?"}
    ]
  }'

Using the A4F API directly

curl https://api.a4f.co/v1/chat/completions \
  -H "Authorization: Bearer YOUR_A4F_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "provider-1/chatgpt-4o-latest",
    "messages": [
      {"role": "user", "content": "What is the meaning of life?"}
    ]
  }'

The API also supports streaming.

Using third-party SDKs

For information about using third-party SDKs and frameworks with A4F, please see our frameworks documentation.

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