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It can't read PDFs. If you ask it to, it generates code to read the first X characters of the PDF and does a bad job.

(Claude is much better at it.)

Yes it can - both via websearches and uploaded (atleast I'm doing it daily).

EDIT: This article says its only in ChatGPT Enterprise, but works for me on free plan: https://help.openai.com/en/articles/10416312-visual-retrieva...

That article is referencing visuals embedded in PDFs. As a free user you wouldn't be able to ask ChatGPT to analyze a graph inside a PDF, only text.