“PDFs are notoriously difficult for machines to parse, in part, because they were never meant to be read by them.“

https://www.theverge.com/ai-artificial-intelligence/882891/ai-pdf-parsing-failure

How many AIs does it take to read a PDF?

For all of the AI industry’s advancements, the major models like ChatGPT and Claude still struggle with PDFs, one of the oldest and ubiquitous file formats.

The Verge