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Getting Started with BAML

Welcome to BAML! This tutorial will walk you through setting up your first project and creating a simple AI function.

Prerequisites​

Before you begin, make sure you have:

  • Node.js 18+ or Python 3.9+
  • An API key from OpenAI, Anthropic, or another supported provider

Installation​

npm install @boundaryml/baml

Your First BAML Function​

Create a file called main.baml:

function ClassifySentiment(text: string) -> Sentiment {
  client GPT4
  prompt #"
    Classify the sentiment of this text:
    {{ text }}

    Respond with: positive, negative, or neutral
  "#
}

enum Sentiment {
  positive
  negative
  neutral
}

client<llm> GPT4 {
  provider openai
  model gpt-4
}

Next Steps​

  • Learn about the BAML type system to understand how structured outputs work
  • Explore the Cookbook for more classification examples
  • Check the Reference for complete syntax documentation
tip

Try the Interactive Tour for hands-on learning!