Not sure if it's what's used in the Azure Document Intelligence service, but my experience with it is pretty good. The one somewhat unique offering in Azure is

Not sure if it's what's used in the Azure Document Intelligence service, but my experience with it is pretty good. The one somewhat unique offering in Azure is the Document Layout model which gives you back the OCR with titles, headers, paragraphs, and tables all labeled. This is really, really good for RAG since it's often useful to stuff the nearest header into the chunk of text when generating an embedding (much, much better results this way).