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Regarding your question, if there is any getting started notebook on how to use Langchain with Open AI models.
Yes, there is a getting started notebook available on how to use Langchain with OpenAI models deployed on Azure.
You can find it on the Microsoft Learn website1. Additionally, there is a notebook available on the Langchain website that goes over on how to use Langchain with Azure OpenAI.
For more information read the following links:
Quickstart guides Langchain with Python.
There are more than enough resources depend on your options.
Kindly let us know if the above is helpful.