LangChain

LangChain provides the building blocks for chaining LLM calls with tools, memory, retrieval (RAG), agents, and more. The most popular LLM framework with integrations for 100+ providers. Includes LangGraph for stateful agents and LangSmith for observability. Best for developers building production AI applications that need tool use, RAG, or multi-step reasoning.

AI ToolFree Tier: Fully free, open-source (MIT)Company: LangChain, Inc.Category: Git ReposOpen Source: YesQuick Start: pip install langchain langchain-openai → from langchain_openai import ChatOpenAI → llm = ChatOpenAI(model='gpt-4o') → llm.invoke('Hello')

LangChain

106K★ — The standard framework for building LLM-powered applications

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LangChain provides the building blocks for chaining LLM calls with tools, memory, retrieval (RAG), agents, and more. The most popular LLM framework with integrations for 100+ providers. Includes LangGraph for stateful agents and LangSmith for observability. Best for developers building production AI applications that need tool use, RAG, or multi-step reasoning.

FREE TIER
Fully free, open-source (MIT)
COMPANY
LangChain, Inc.
CATEGORY
Git Repos › AI & ML
OPEN SOURCE
Yes
PRIVACY
Framework only; data goes to your chosen LLM provider
TAGS
llmagentsragframeworkproduction

QUICK START

pip install langchain langchain-openai → from langchain_openai import ChatOpenAI → llm = ChatOpenAI(model='gpt-4o') → llm.invoke('Hello')

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