AI Checker Flagged You: What the Score Means and How to Cut It

An AI checker is a probability tool, not a verdict. It reads your text and estimates how likely each part looks machine-generated. That estimate can be wrong, especially on short passages, formal writing and non-native English. The useful move is not arguing with the number. It is finding which sentences carry the signal and editing those.

What an AI checker actually measures

Detectors do not recognise authorship. They measure surface properties of your prose and compare them to patterns seen in generated text. The two named most often are perplexity (how predictable each word is given the ones before it) and burstiness (how much sentence length and structure vary). Machine output tends to be smooth: evenly sized sentences, tidy transitions, low surprise. Human writing is lumpier.

That is why a flag is not proof. A tightly controlled academic register, a translated paragraph, or a paragraph where every sentence happens to be the same length all read as “smooth” to a detector even when a person wrote them. Our own measurement, run on 2026-09-28 with the DeAIze detector (local ensemble, lite tier, 30% flag threshold), scored 709 hand-written DeAIze guides at a mean AI score of 26% and a median of 25%, with 239 of those 709 flagged at that threshold. Human-written text does land in flag territory. It is not rare.

What should you do with that? Read the score as a map, not a sentence. Whole-document numbers hide the useful detail: which lines are doing the damage. Sentence-level highlighting matters more than the headline percentage, because you can only fix a sentence.

Why your own writing gets flagged

Three causes cover most cases.

1. Uniform rhythm. Every sentence lands between 18 and 24 words. Paragraphs open with a transition and close with a summary. Nothing is abrupt.
2. Generic phrasing. “It is worth considering”, “plays a crucial role”, “in today’s environment” — these carry no information, and they are exactly the strings generated text over-produces.
3. Register mismatch. Formal, impersonal, heavily nominalised prose (“the implementation of the policy resulted in a reduction of”) looks machine-made because the model was trained on a lot of it.

Non-native writers get hit hardest by the third cause, because a clean, careful, grammatically even style is what they were taught to produce. That is a real problem with the tool, not with the writer, and it is worth documenting rather than rewriting your voice away.

Before you rewrite anything, look at the sentence-level view, not the document score. If you want to see which lines carry the signal, run the text through the AI detector and read the per-sentence highlighting first — it tells you where to spend your editing time.

The three-pass fix that actually lowers the rate

Work in this order. Most drafts come down after the second pass.

Pass 1 — kill the tells. Search for the phrases you know are filler and delete them. Em dashes used as a rhythm device, “moreover”, “furthermore”, triads of adjectives, and sentences that restate the previous sentence in different words. Deleting is better than replacing: fewer words, less surface for the detector to read.

Pass 2 — break the rhythm. Read the paragraph aloud. Where you run out of breath, split the sentence. Where two sentences are the same length, merge them or cut one to four words. Add one short sentence per paragraph — five to eight words. Deliberate unevenness is the single highest-yield edit.

Pass 3 — put a person back in. Add one specific detail only you could supply: a date, a place, a number from your own work, a name, a thing that went wrong. Detectors have no signal for specificity, and readers notice it immediately.

Here is an illustration, not a real submission:

Before	After
“The implementation of the new system resulted in a significant improvement in overall efficiency across departments.”	“We switched systems in March. Ticket times dropped by about a third, mostly because the old queue disappeared.”

The second version is shorter, uneven, and contains a detail a model would not have invented. That is the whole method.

How long should the fix take?

Budget roughly one minute per hundred words for passes 1 and 2. A 1,500-word essay is a 15-minute job, not an afternoon. If it is taking longer, you are rewriting content rather than editing surface, and you will lose your argument.

When it is worth automating: you have a long document, the flagged sentences are scattered, and re-checking each rewrite by hand is the slow part. DeAIze runs the loop in one pass — score the text, rewrite only the flagged sentences, keep a rewrite only when semantic similarity says the meaning survived, then re-score and report before and after. On the example paragraph used on the site, a 92% AI score becomes 4% AI. The site reports an average AI-score reduction of 60%+ after humanizing (best case 71%), and those are its own predicted scores, not an official verdict from a third-party detector. Cross-checks run the output against real third-party detector APIs where configured — GPTZero, Turnitin, Copyleaks, Originality.ai and Sapling — rather than trusting an internal guess.

Comparison: what each route costs and what it fixes

Figures below come from the third-party sources named beside them, plus our own pricing.

Route	Cost	What it is built for	What it will not fix
Manual sentence-level edit	Your time	Any draft, any language	Nothing — but it is slow on long documents
Grammarly Pro (detection inside Authorship Pro)	$12/month on annual billing, $30/month month-to-month, per Grammarly’s own plans page as reported by writehuman.ai	A quick gut check on one paragraph	A 5,000-word thesis; the same source notes the 2.5x penalty for paying monthly
Grammarly AI Checker accuracy claims	99% claimed by Grammarly; 91% per one competitor humanizer’s review; 33% per a competing detector’s testing; 95% on raw AI text but 16% once lightly paraphrased, per Proofademic — all as reported by writehuman.ai	Understanding how much these numbers vary by test design	Nothing on its own — the spread is the point
DeAIze humanizer	Starter $20.99 / 1,000 words; Standard $44.99 / 3,000; Pro $99.99 / 10,000; Max $199.99 / 30,000. Pay-as-you-go, credits never expire, no subscription. Free tier: 200 words on signup, no credit card	Sentence-level rewrite with a meaning check and before/after re-score	It is not a tool for passing off someone else’s work, and it does not guarantee any score on any detector

That accuracy row is not a dig at anyone. It is the most useful fact in this article: the same text can be scored 95% and 16% depending on whether it was lightly paraphrased, per the writehuman.ai report. A 2023 Stanford study cited in that same report found GPT detectors flagged 61% of TOEFL essays as AI-written. Detector output is a probability estimate. Treat it that way.

When this is the wrong choice

Do not buy a humanizer if any of these apply.

• The ideas are not yours. Rewriting does not make someone else’s argument your work. Fix the sourcing, not the surface.
• Your institution requires disclosure. If you used a model to draft and the policy says declare it, declare it. Editing the text to hide the use is a separate, worse problem than the flag.
• You need a specific score on a specific detector. Nobody can guarantee that. DeAIze does not, and any tool that does is selling you something it cannot deliver.
• The text is under about 150 words. Short passages give detectors too little signal, and edits that chase a noisy score usually damage the writing.
• You are a non-native writer being penalised for clean grammar. Document the pattern, keep samples of your earlier work, and raise it. Rewriting yourself into deliberate sloppiness is the wrong answer.

What to do in the next ten minutes

Open the document. Run it through a detector that shows sentence-level output. Sort by flagged sentences, then work top-down with the three passes. Re-score. If the number is still high, look at what the remaining flagged sentences have in common — it is usually one habit repeated, not a document-wide problem.

If you want the longer version of this workflow, the humanize AI text guide covers the full pass order, and the AI checker for essays page covers what to write if you have to respond to an accusation rather than just fix the text. Both are free to read. Neither requires you to buy anything.

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Measurement note: figures in this article come from our own detector run on 2026-09-28 — n = 709 hand-written guides versus n = 12 unedited model outputs, median AI score 25% and 34% respectively. Method: /methodology/.