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Editing with AI? Ask it to mark every sentence it changed.

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Editing with AI? Ask it to mark every sentence it changed.
What most of us do. We paste the email, ask for something clearer, and copy the result back. Then we can't see what moved, so a reworded rule or date can slip through unnoticed.

What most of us do

We paste the email, ask for something clearer, and copy the result back. Then we can't see what moved, so a reworded rule or date can slip through unnoticed.

The prompt I tested. The last two sentences are the new part. Remove names and other personal details first, and check the tool's data policy or your employer's approved tools before pasting a real email.

The prompt I tested

Edit this email so it is clearer and friendlier. Keep every fact the same. Put every sentence you changed in **bold**. Then, under the email, list each change and the reason for it.

Tested in GPT-5.5 (OpenAI API), Oct 2026

The last two sentences are the new part. Remove names and other personal details first, and check the tool's data policy or your employer's approved tools before pasting a real email.

The sample email I used. A fictional expense-policy update from Marcus: seven sentences in one paragraph. Meals capped at $60 a day, up from $50, receipts over $25, a 30-day deadline, a new form, and Priya for questions.

The sample email I used

A fictional expense-policy update from Marcus: seven sentences in one paragraph. Meals capped at $60 a day, up from $50, receipts over $25, a 30-day deadline, a new form, and Priya for questions.

Source: Our own test runs, GPT-5.5 (OpenAI API), Oct 2026

Changed sentences came back bold. In my first run, the changed sentences came back in bold. The ** marks are how bold arrives in raw text. Mileage, the one sentence it left alone, stayed plain.

Changed sentences came back bold

Real output · GPT-5.5 (OpenAI API) · Oct 2026

**Starting November 1, our expense policy will change.** **Meal claims while traveling will be capped at $60 per day, an increase from $50.** … Mileage stays the same at the current rate.

In my first run, the changed sentences came back in bold. The ** marks are how bold arrives in raw text. Mileage, the one sentence it left alone, stayed plain.

Every change got a reason. Each change got a before, an after and a reason, and every number and date survived in both runs. Look closely: “now” is gone, and the reason doesn't say so.

Every change got a reason

Real output · GPT-5.5 (OpenAI API) · Oct 2026

“Receipts are now required for any claim over $25, it used to be $40.” → “Receipts will be required for any claim over $25; the previous threshold was $40.” … Reason: Fixes the comma splice and clarifies that $40 was the prior threshold.

Each change got a before, an after and a reason, and every number and date survived in both runs. Look closely: “now” is gone, and the reason doesn't say so.

What the list didn't explain. Both runs split my paragraph into seven lines without saying so. Run 2 dropped “now” from one rule with no reason. It also reworded all seven sentences, so everything came back bold and pointed nowhere.

What the list didn't explain

Both runs split my paragraph into seven lines without saying so. Run 2 dropped “now” from one rule with no reason. It also reworded all seven sentences, so everything came back bold and pointed nowhere.

Then check the real differences. Paste the original and the AI version into two Word files, then use Review > Compare > Compare two versions of a document (Mac: Compare Documents). Every change shows as tracked changes.

Then check the real differences

Paste the original and the AI version into two Word files, then use Review > Compare > Compare two versions of a document (Mac: Compare Documents). Every change shows as tracked changes.

Try it: Add the bold-and-list sentences to your next edit, then compare before sending.

Source: Microsoft Support, as of Oct 2026

Sources and assumptions

Assumptions:

The short version

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