Alpha Notice: These docs cover the v1-alpha release. Content is incomplete and subject to change.For the latest stable version, see the v0 LangChain Python or LangChain JavaScript docs.
To install the core LangChain package 
npm install langchain@next
LangChain provides integrations to hundreds of LLMs and thousands of other integrations. To avoid package bloat, these live in independent provider packages. Common packages: 
# Installing the OpenAI integration
npm install @langchain/openai@next
# Installing the Anthropic integration
npm install @langchain/anthropic@next
See the integrations page for a full list of available integrations.