🤖 Spring AI + OpenRouter: The Universal LLM Gateway

This repository demonstrates how to integrate OpenRouter with Spring AI, allowing you to access hundreds of Large Language Models (LLMs) from providers like OpenAI, Google, Anthropic, and many more through a single, unified API. This project showcases the power of switching between different AI models by changing just one line in your configuration file, with zero code modifications.

📖 Dive Deeper: For a complete walkthrough, detailed explanations of OpenRouter's benefits, and step-by-step instructions for building this example application, read our comprehensive blog post.
👉 Integrate OpenRouter with Spring AI: Switch Between 400+ AI Models with Zero Code Changes

🎥 Visual Learning: Prefer video tutorials? Watch our step-by-step implementation guide on YouTube.
👉 YouTube Tutorial - OpenRouter + Spring AI: Access 400+ AI Models with One API

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📦 Environment Variables

Make sure to provide this Java environment variable when running the application:

• OPENROUTER_API_KEY: Your secret API key from the OpenRouter.

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💡 About This Project

This project implements a simple Smart Chat Assistant to demonstrate the ease of integrating OpenRouter with Spring AI. It showcases how to:

• Configure Spring AI to use any OpenAI-compatible API endpoint.
• Use a single ChatClient to access a vast array of models.
• Switch between different LLMs (e.g., from a free model to a paid one like GPT-4o) just by editing the application.yml file.

The application exposes a simple REST endpoint that takes a user's message, sends it to the configured model via OpenRouter, and returns the AI-generated response.

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