The GPTs "knowledge" feature is exactly that - it's RAG, with the ability to upload documents and have it chunk them, embed them, vector store them and use that to help answer questions.

The problem is it's not very well documented and hard to get good results out of, at least in my experience so far. I'm confident they'll fix that pretty quickly though.

They already did https://platform.openai.com/docs/assistants/tools/knowledge-...