LangChain Framework

LangChain 框架

Framework for building LLM-powered applications with chains, agents, RAG, and tool integration.

构建 LLM 应用的框架，支持链、Agent、RAG 和工具集成。

Endpoints

SDKs

Key Features

• ◆Chain composition framework
• ◆Agent & tool integration
• ◆RAG building blocks
• ◆LangSmith observability
• ◆Multi-provider support

Code Examples

from langchain_core.prompts import ChatPromptTemplate
from langchain_openai import ChatOpenAI

prompt = ChatPromptTemplate.from_template("Tell me a {topic} joke")
model = ChatOpenAI(model="gpt-4o")
chain = prompt | model

result = chain.invoke({"topic": "programming"})
print(result.content)

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