No direct recommendation for that use case, but one strategy I've heard being used and that works with complex documents (or where hallucinations are Very Bad™ - like invoice processing) is using multiple techniques and models at once in a quorum approach. For example, direct ingestion of PDFs into Gemini, OCR and ingestion of text, plus perhaps using another model like GPT. If they all agree on a fact, you're (probably) good. If not, it can be bumped up to human correction.
Honestly though, I hope that the google notbooklm https://notebooklm.google/ doesn't go to the google graveyard. It is great for feeding a decent amount of information and helping you process it. I've found great success at it.
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[ 4.3 ms ] story [ 34.9 ms ] threadI see plenty of examples like the one here that are on easier extractions. A PDF to HTML or Markdown converter will probably get it right with OCR.