Introduction – why long‑document analysis matters
Professionals often need to comb through contracts, research papers, or reports that run into dozens or hundreds of pages. An AI assistant that can ingest the whole text, keep context, and return precise excerpts saves hours of manual scrolling.
Brief overview of Claude, ChatGPT, and Gemini
All three services let you upload documents and ask natural‑language questions. Their main differences lie in context window size, file‑size caps, and extra features such as role‑setting or advanced data analysis.
Token & context windows for each assistant
- Claude: 200 K‑token window on Pro/Teams plans. The window counts both the document text and the conversation, so extensive back‑and‑forth can consume the limit quickly.
- ChatGPT: No independently verified token/context-window figure is available; the file-upload size is capped at 512 MB on free and paid plans.
- Gemini: No explicit token count is listed in the research, but the file‑size limit is 100 MB per file with a maximum of ten files per prompt.
File upload capabilities and size limits
Claude accepts PDF, Word, and plain‑text files via a paper‑clip icon. It cannot read image‑only PDFs without an external OCR step. ChatGPT accepts a broader range (PDF, Word, CSV, etc.) but image‑based PDFs require an Enterprise Visual Retrieval add‑on. Gemini’s web app or Chrome extension lets you drag‑drop files, respecting the 100 MB per‑file ceiling.
Step‑by‑step workflow for Claude
- Choose a Pro or Teams plan to unlock the 200 K‑token window.
- Upload your PDF or Word file using the paper‑clip icon.
- Set a role that matches your use case, e.g., “You are a legal analyst reviewing a procurement contract.”
- Ask a single, precise question (often called a “precis”).
Step‑by‑step workflow for ChatGPT
- Confirm that file‑upload capability is enabled in your account settings.
- Click the Upload button and select your document (up to 512 MB per file).
- Enter a prompt such as “Extract every mention of ‘termination clause’ from the uploaded contract and provide the surrounding paragraph.”
- If you need to work with scanned PDFs, upgrade to an Enterprise plan for Visual Retrieval.
Step‑by‑step workflow for Gemini
- Sign in with a Google account (personal or organizational).
- Open gemini.google.com or the Gemini Chrome extension.
- Click “Add files → Upload files” (or drag‑drop) and add up to ten files, each no larger than 100 MB.
- Prompt the model, for example, “Act as a legal analyst and list every indemnity clause in the attached contract, quoting the exact language and clause numbers.”
Key features that aid document analysis
- Role‑setting (Claude): Lets you steer the assistant’s tone and expertise before asking a question.
- Projects (Claude): A feature for managing multi‑document workspaces, useful when you need to reference several related files.
- Advanced Data Analysis (ChatGPT): Handles tabular extraction, which can be handy for spreadsheets embedded in reports.
Data privacy, confidentiality, and retention considerations
Claude’s Pro/Teams plans do not use your data to train models by default, though you should review Anthropic’s data‑handling policy for any edge cases. ChatGPT states that uploaded files are not used to train consumer models, but Enterprise and Business plans have separate policies that may retain data longer. Gemini stores files in the user’s Google Drive environment, so organizational settings an [Draft truncated here for length — more content follows in the real draft; do not assume this is the end of the article, and do not delete or shorten anything past this point on the assumption it doesn’t exist.]
Frequently Asked Questions
What is the maximum number of tokens Claude can handle in a single session?
Claude offers a 200 K‑token context window on Pro and Teams plans, which includes both the uploaded document text and the ongoing conversation.
How large a PDF can I upload to Gemini in one prompt?
Gemini limits each uploaded file to 100 MB and allows up to ten files per prompt.
Does ChatGPT keep my uploaded documents after the session ends?
Uploaded files are not used to train consumer models, but Enterprise and Business plans have separate data‑usage policies that may retain data longer.
Can I set a specific role for Claude to focus on legal contract review?
Yes. Claude lets you define a role, such as “You are a legal analyst reviewing a procurement contract,” before asking your precise question.
What steps do I need to follow to analyze a multi‑page contract with each assistant?
For Claude: choose a Pro/Teams plan, upload the contract, set a role, then ask a concise question. For ChatGPT: enable file uploads, upload the contract (up to 512 MB), then issue your extraction prompt. For Gemini: sign in with Google, add the contract via the file picker (under 100 MB), and prompt the model with your analysis request.