---
id: langchain-classic
version: "1.0.8"
license: MIT
license_treatment: permissive
maintenance: active
---

# langchain-classic — Building applications with LLMs through composability

License: permissive · Maintenance: active · Popularity: top 1,000 on PyPI

## Install

pip install langchain-classic
uv add langchain-classic
poetry add langchain-classic

## Description

# 🦜️🔗 LangChain Classic

[![PyPI - Version](https://img.shields.io/pypi/v/langchain-classic?label=%20)](https://pypi.org/project/langchain-classic/#history)
[![PyPI - License](https://img.shields.io/pypi/l/langchain-classic)](https://opensource.org/licenses/MIT)
[![PyPI - Downloads](https://img.shields.io/pepy/dt/langchain-classic)](https://pypistats.org/packages/langchain-classic)
[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain_oss)

Looking for the JS/TS version? Check out [LangChain.js](https://github.com/langchain-ai/langchainjs).

To help you ship LangChain apps to production faster, check out [LangSmith](https://www.langchain.com/langsmith).
[LangSmith](https://www.langchain.com/langsmith) is a unified developer platform for building, testing, and monitoring LLM applications.

## Quick Install

```bash
pip install langchain-classic
```

## 🤔 What is this?

Legacy chains, `langchain-community` re-exports, indexing API, deprecated functionality, and more.

In most cases, you should be using the main [`langchain`](https://pypi.org/project/langchain/) package.

## 📖...

## AI interpretation — verify before relying

LangChain Classic provides legacy chains, community re-exports, indexing APIs, and deprecated functionality for LLM application development, intended as a compatibility layer rather than primary entry point.

Verdict: Actively maintained compatibility package for legacy LangChain code with permissive MIT licensing and low install friction. Suitable for projects requiring deprecated functionality or community re-exports, but new development should prefer the main langchain package. No known vulnerabilities.

[View on SkillFed](https://skillfed.io/packages/langchain-classic) · [View on PyPI](https://pypi.org/project/langchain-classic/)