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It's not. The API is different, since GPT-4 is a chat based model, and davinci isn't. It's not a huge difference, but these little sort of things add up.

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It is a very minor change (made the changes in minutes and didn't have to bring in a new framework for it).

Agreed. It's a trivial change, certainly not a justification for using langchain.

I see, thought you were using GPT-3.5 and moved to GPT-4.

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