Langchain.rb

Ruby library for LLM-powered apps with a unified LLM interface, prompt tools, output parsers, RAG and assistants.

IndexedMIT★ 2,006

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gem install langchainrb

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About

Langchain.rb is a Ruby library for building LLM-powered applications, with use cases in retrieval augmented generation with vector search and chat assistants. Its LLM classes share one interface for embeddings, prompt completions and chat completions, so backends can be switched without changing application code. The README also lists prompt management, output parsers, evaluations and logging, and points to a separate gem for Rails integration.

Use cases: knowledge-base, model-inference

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Fact sheet

Languages: RubyREADME
Packages: langchainrb (gem)README
Model providers: anthropic, aws-bedrock, azure-openai, cohere, google, huggingface, mistral, ollama, openai, replicateREADME
Maturity: Betagithub.com

Facts extracted by Claude Haiku 5.5 from the linked sources on Oct 24, 2026. Wrong fact? Tell us.

Alternatives

Frameworks for the same language with a similar way of orchestrating agents.

Signals

Stars: 2,006
Forks: 268
Open issues: 37
Last commit: Oct 21, 2026 (7 days ago)
Last release: May 1, 2025 (1 year ago)

From GitHub (fetched Oct 24, 2026).

Details

Packages: gem langchainrb
License: MIT
Repository: github.com/patterns-ai-core/langchainrb
Website: rubydoc.info/gems/langchainrb
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: README github-graphql

Cite this page

Langchain.rb. Agent Mart. https://agentmart.dev/harnesses/langchain-rb (last updated 2026-10-24)