What is LangChain.rb and how do I install it?

LangChain.rb is Ruby's port of LangChain for AI chains, agents, memory, and RAG. `gem install langchainrb` or add to Gemfile.

Does LangChain.rb support local LLMs like Ollama?

Yes, plug in Ollama with `Langchain::LLM::Ollama.new(url: "http://localhost:11434")`. No cloud needed.

Can LangChain.rb replace manual RAG builds in Ruby?

Absolutely — `pgvector.ask(question: "Your query")` handles retrieval, embedding, and LLM call in one go.

🤖 AI & Machine Learning

LangChain.rb Drops: Ruby Finally Gets AI Plumbing That Doesn't Suck

You're knee-deep in OpenAI API calls, pgvector hacks, and agent loops that break on the first edge case. Then LangChain.rb shows up, promising to fix the mess. But does it?

theAIcatchup Apr 09, 2026 3 min read

Ruby code snippet running LangChain.rb agent with OpenAI LLM

⚡ Key Takeaways

LangChain.rb ports Python's LangChain to Ruby, slashing AI boilerplate for chains, agents, RAG, and memory. 𝕏
Supports OpenAI, Anthropic, Ollama, pgvector — swap providers smoothly. 𝕏
Game-changer for Rails AI apps, like early Rails was for web dev. 𝕏

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theAIcatchup

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#AI agents Ruby #LangChain.rb #RAG Ruby #Ruby AI

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Originally reported by Dev.to

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