// Build agent apps
langchainlangchain==1.4.7
The agent engineering platform.
Open source Maintained For developers
IN ONE PARAGRAPH
langchain is the agent engineering platform.
Good for: Developers and teams who want to build agent apps.
01How to start
- 1Read the official quick-start (link above).
- 2Install from the official package registry:
pip install langchain-cli - 3Try it on a small example before wiring it into a project.
02Alternatives & comparison
Compare side by side → langgraph Build resilient agents. ★ 44k voltagent AI Agent Engineering Platform built on an Open Source TypeScript AI Agent Framework ★ 11k autogen A programming framework for agentic AI ★ 62k harness-sdk Build an agent harness and control it end-to-end. Open-source SDK for production AI agents in Python & TypeScript - any model, any cloud. ★ 8.9k haystack Open-source AI orchestration framework for building context-engineered, production-ready LLM applications. Design modular pipelines and agent workflows with explicit control over retrieval, routing, memory, and generation. Built for scalable agents, RAG, multimodal applications, semantic search, and conversational systems. ★ 27k
03Related
- ›LangChain Academy · LangChainEnglish
- ›LangGraph 文档 · LangChainEnglish
- ›LangChain RAG 教程 · LangChainEnglish
- All tutorials →
Versions, why it is listed, for AI to read
Recent releases
- langchain==1.4.4 2026-10-08
- langchain-core==1.6.9 2026-10-08
- langchain-openai==1.7.0 2026-10-08
- langchain-core==1.6.8 2026-10-08
- langchain-fireworks==1.7.1 2026-10-07
For AI agents
- Interfaces：SDK
- Machine-readable record：/api/v1/software/langchain.json · llms.txt
- Added 2026-10-10 · updated 2026-10-22