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OpenRouter LLM Example
This example demonstrates how to use OpenRouter with langchaingo. OpenRouter provides a unified API to access various LLM models through a single endpoint.
About OpenRouter
OpenRouter is an AI routing service that provides:
- Access to multiple LLM providers (OpenAI, Anthropic, Google, Meta, etc.) through a single API
- Automatic failover and load balancing
- Usage tracking and analytics
- Support for both free and premium models
Setup
- Get an OpenRouter API key from https://openrouter.ai/
- Set the environment variable:
export OPENROUTER_API_KEY="your-api-key-here"
Usage
OpenRouter uses an OpenAI-compatible API, so you can use the OpenAI client with a custom base URL:
llm, err := openai.New(
openai.WithModel("meta-llama/llama-3.2-3b-instruct:free"),
openai.WithBaseURL("https://openrouter.ai/api/v1"),
openai.WithToken(apiKey),
)
Available Models
OpenRouter provides access to many models including:
- Free tier:
meta-llama/llama-3.2-3b-instruct:free,google/gemma-2-9b-it:free - Premium: GPT-4, Claude, Gemini Pro, and many more
- Check https://openrouter.ai/models for the full list
Running the Example
go run openrouter_llm_example.go
Features
- ✅ Streaming responses supported
- ✅ Compatible with OpenAI client
- ✅ Access to multiple model providers
- ✅ Automatic handling of provider-specific quirks