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To install the LangChain package: 
npm install langchain @langchain/core
LangChain provides integrations to hundreds of LLMs and thousands of other integrations. These live in independent provider packages. For example: 
# Installing the OpenAI integration
npm install @langchain/openai
# Installing the Anthropic integration
npm install @langchain/anthropic
See the Integrations tab for a full list of available integrations.
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