By Latitudes Training, Coaching & Consulting · Published
When is AI useful for comparing document versions?
You receive a revised announcement, a new event notice or an updated set of routine instructions. The wording looks familiar, but you need to understand what changed before you use it. AI can suggest a change summary and help you turn that summary into questions for the document owner.
Start with a short, ordinary document where you can check every line yourself. Comparing wording is a different task from deciding whether the new wording is correct, approved or ready to send.
If you need a precise record of every textual edit, use your document editor's comparison feature as well. AI's explanation can support your review, but it should not become your only record of the differences.
How should you prepare the two versions?
Keep the original files unchanged. Make separate working copies and label them clearly, such as Version A: original and Version B: revised. Include a version date or filename if one is available. Do not assume the file received most recently is the approved version.
For practice, use the fictional notice below. For actual work, use only material you are permitted to share in the chosen tool. Do not upload confidential client documents or personal information just to try the exercise.
ChatGPT's current file-upload documentation lists document comparison as a supported use and describes accepted file types. Availability and limits depend on your account and settings. For a short exercise, pasting clearly labeled text may be all you need.
If you copy text from a PDF or another file, compare the copied text with the visible original first. Missing table cells, footnotes or headings can make the comparison incomplete before AI even begins.
What does a simple document comparison look like?
These two staff briefing notices are invented solely for this exercise. They are not real Latitudes client documents or results from testing a particular AI tool.
Version A: original. The staff briefing is Monday at 9 a.m. in Room B. Bring your laptop. Parking is available behind the building.
Version B: revised. The staff briefing is Tuesday at 10 a.m. in Room C. Bring your laptop. Confirm attendance by Monday at 5 p.m.
A careful comparison of these exact passages identifies the following changes:
- The briefing day changes from Monday to Tuesday.
- The start time changes from 9 a.m. to 10 a.m.
- The room changes from Room B to Room C.
- The revised notice adds an instruction to confirm attendance by Monday at 5 p.m.
- The revised notice removes the sentence about parking behind the building.
- The instruction to bring a laptop stays the same.
What prompt should you use to compare the versions?
Give the tool a narrow job and require evidence for each suggested difference. Separate additions, removals and changes so a shorter revised document does not look complete simply because its summary reads smoothly.
Paste this prompt above the two labeled versions. If the output misses something, ask about the specific passage rather than accepting a more confident general summary.
A prompt to adapt
Compare Version A (original) with Version B (revised). Use only the text I provide. List added, removed and changed information separately. For each difference, quote the relevant short passage from each version, or write 'not present' where appropriate, and explain the difference in plain language. Identify important instructions that stay the same. Do not invent reasons for edits, calendar dates or approval status. Flag ambiguity instead of resolving it by guessing. Do not rewrite either version. End with questions a human should verify before using the revised document. Version A (original): [paste permitted text] Version B (revised): [paste permitted text]
How do you check whether the AI comparison is accurate?
Read the original and revised text side by side. For each proposed change, find the supporting words yourself. Check numbers, times, names, locations, deadlines and instructions individually. Then scan both documents for details the output did not mention.
In the fictional example, removing the parking sentence does not establish that parking is unavailable. It establishes only that the revised notice no longer includes that statement. The document owner needs to clarify whether parking information should be restored or updated.
The notice also gives weekdays without calendar dates. Do not let the tool invent a date or claim anyone has confirmed attendance. A useful follow-up question is: Which calendar dates should appear in the final notice?
OpenAI's guidance explains that ChatGPT can give incorrect or misleading answers, including confident ones. Treat a polished comparison as a draft to inspect. Our guide to checking AI answers explains how to separate a claim from the evidence supporting it.
When should you use Word's Compare feature too?
When an edit-by-edit record matters, use a tool designed to compare the text. Microsoft's guidance for Word on Windows describes opening Review, choosing Compare and selecting the original and revised documents. By default, Word displays the comparison in a third document. Keep that default if you want to preserve the two source files.
Review the comparison settings, including whether you are checking text, formatting or comments. Then use the change record to check any AI-generated explanation. A factual edit and a formatting edit may need different attention.
For longer files, work through one named section at a time and keep a section checklist. If the tool cannot read an attachment or a section is missing, stop and resolve that gap before treating the review as complete.
How can you turn this into a useful AI skill?
Repeat the exercise with another short fictional announcement. First identify the changes yourself, then compare your list with the AI output. Notice whether your prompt makes the supporting evidence easier to review.
Keep the prompt and your review checklist together. The useful habit is asking a clear question, supplying the right material and checking the result before acting on it.
Marcela Arenas delivers practical AI training through Latitudes Training, Coaching & Consulting. If comparing routine documents is a task you would like to understand better, contact Latitudes about training around your learning goals. You can also explore our services and our guide to getting started with AI in your business.
Frequently asked questions
Do I need to upload the full documents?
Not for a short practice exercise. You can paste two clearly labeled, permitted text excerpts. If you compare excerpts, describe the result as a comparison of those excerpts, not the complete files. Check that no missing section affects the question you are asking.
Can AI guarantee that no changes were missed?
No. AI can omit edits, misread wording or suggest unsupported differences. Review both versions yourself and use a document editor's comparison feature when an edit-by-edit record matters.
Does a removed sentence mean the information is no longer true?
No. It means the sentence is absent from the revised text. Ask the document owner whether the underlying information changed, was intentionally omitted or needs to be restored.
General education. Examples and prompts are illustrative. Check current vendor features, terms and settings before use. For legal, medical or other professional decisions, consult an appropriately qualified person.