[felipesabino]

It seems to be a paid version of https://github.com/mayooear/gpt4-pdf-chatbot-langchain

It uses langchain and pinecone to create a semantic index over the PDF content and search it based on question asked to sends the relevant information to openAI GPT api using embeddings.

[nextworddev]

You absolutely don’t need Langchain for any of this.

[sensibar]

No, it doesn't use langchain and yes it uses OpenAI.

[felipesabino]

Care to elaborate? I mean, looking at the source code it clearly does use LangChain for PDF ingestion https://github.com/mayooear/gpt4-pdf-chatbot-langchain/blob/...

[ffpip]

He might mean the site chatpdf.com does not use langchain but uses the OpenAI API.

[sensibar]

Yes, that's what I meant.