Which AI to use for summarizing a PDF?
To summarize a PDF in 2026, the best options depend on document size. For short documents (up to 200 pages), Claude Sonnet 4.5 is the reference: its 200K-token context window swallows the full file in one request, no truncation. For very long documents (500+ page manuals, full codebases, complete books), Gemini 2.
To summarize a PDF in 2026, the best options depend on document size. For short documents (up to 200 pages), Claude Sonnet 4.5 is the reference: its 200K-token context window swallows the full file in one request, no truncation. For very long documents (500+ page manuals, full codebases, complete books), Gemini 2.5 Pro with its 2M-token context window is unbeatable — about 1,500 pages in one shot. Practical approach: open your PDF, copy-paste the text into the chat (or upload directly if the interface supports it), then ask "Summarize this in 10 key points", or "Extract the important figures", or "Identify the main risks for an investor". Typical cost: €0.02 to €0.15 to summarize a 50-page PDF depending on the model. Ask Aurel supports PDF and image attachments on paid tier accounts.