Alpha Notice: These docs cover the v1-alpha release. Content is incomplete and subject to change.For the latest stable version, see the current LangChain Python or LangChain JavaScript docs.
To install the core LangChain package 
pip install -U langchain
LangChain does not bundle inside of the the specific LLM (or other) integration packages. This is done on purpose to avoid package bloat. In order to access different providers, you will need install them one by one. See the LLM integrations page for instructions on how to do that.