ChatGPT vs Claude for PDFs in 2026: Which Is Better?

TL;DR

Claude wins for long PDFs (50+ pages), legal contracts, and anything where missing a detail is expensive. ChatGPT wins for image-heavy PDFs, quick summaries, and when you need to extract data into a spreadsheet via Code Interpreter.

How we tested

We uploaded the same five PDFs to both tools: a 12-page invoice, a 60-page research paper, a 280-page legal contract, a 40-page scanned (image-only) report, and an image-heavy product brochure. We then asked identical questions and graded accuracy, depth, and how often each tool 'forgot' something from earlier pages.

Short PDFs (under 30 pages)

Tie. Both ChatGPT and Claude handle short PDFs accurately. ChatGPT is slightly faster; Claude gives slightly more thorough summaries. For a one-off invoice or a short report, either is fine.

Long PDFs (50+ pages)

Claude wins clearly. Its 200K-token context window means a 200-page PDF fits in one shot without chunking. We asked obscure questions about page 180 of a 280-page contract — Claude found them; ChatGPT (on a non-Pro plan) hallucinated.

Scanned / image-only PDFs

ChatGPT wins. Its vision pipeline handles scanned pages noticeably better than Claude's, especially for tables, signatures, and handwritten notes. For scanned documents, ChatGPT is the better default.

Data extraction and spreadsheets

ChatGPT wins, decisively. Code Interpreter (Advanced Data Analysis) lets you say 'extract every line item from this invoice and give me a CSV' and actually get a working file back. Claude gives you the data as a table you copy-paste.

Legal contracts, policies, research papers

Claude. The combination of long context, careful reasoning, and a tendency to hedge rather than invent makes it the safer pick for any document where 'roughly right' is wrong.

Our pick

If you can only have one: Claude for serious PDF work, ChatGPT for everything else. If you can have both: use Claude as your 'document tool' and ChatGPT as your 'spreadsheet + image tool'.

Frequently asked questions

Which has a larger PDF upload size — ChatGPT or Claude?

Claude — up to ~32MB per file on the consumer app and effectively the whole 200K context. ChatGPT Plus caps at smaller per-file sizes and chunks long PDFs more aggressively.

Can either read scanned PDFs?

Yes, both have OCR via vision models. ChatGPT's OCR is currently more accurate on poor-quality scans.

Which is better for legal PDFs?

Claude. Lower hallucination rate, longer context, and a cautious tone that suits legal work.

Can I get a CSV out of a PDF with these tools?

ChatGPT with Code Interpreter gives you a downloadable CSV directly. Claude gives you a table you can copy into a sheet.