Build LLM-backed Ruby applications with Ruby's Langchain.rb

The only agent-oriented AI framework designed for Rails, where Agents are Controllers. Build AI features with less complexity using the MVC conventions you love.

You simply set an OpenAI key, give a number of Boxcars to a Train, and magic ensues when you run it.

Ruby library for interacting with various LLM providers including Anthropic, Google Gemini, xAI, and other OpenAI-compatible API providers (including local models). Supports streaming, event-handling, conversation management, tool-use, image input, and cost-tracking.