How to Pass Grammarly AI Detection in 2026
5 min read
Grammarly's built-in AI detector runs automatically on most accounts now, which is exactly why so many people are searching for how to pass Grammarly AI detection without rewriting an entire piece from scratch. Grammarly's checker works similarly to other detectors, scoring word predictability and sentence uniformity, but it's tuned specifically around the writing styles Grammarly sees most, business emails, essays, and marketing copy.
How Grammarly's AI detector actually works
Grammarly added its AI detector as part of the same browser extension and web editor most people already use for grammar checking, which is exactly why it catches so many drafts by surprise, the check runs quietly in the background rather than as a separate step you opt into. Like other detectors, it scores predictability and sentence-level uniformity, but it's tuned around the kinds of writing Grammarly sees most: emails, essays, and marketing copy.
What makes Grammarly flag your writing as AI
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Try RewriteMate Free, 500 Words →Grammarly's detector reacts to the same tells other tools do: an absence of contractions, transitions that repeat mechanically ("furthermore," "in addition"), sentences that cluster around the same length, and a lack of the small hedges and asides real writing accumulates. Business writing is particularly prone to this, formal tone and consistent structure are taught skills, and they happen to overlap heavily with what a detector flags.
Step-by-step: how to pass Grammarly AI detection
- Paste your draft into RewriteMate
- Choose Professional mode for business writing, or Casual for blog and social copy
- Click Humanize and compare the rewrite against your original for meaning
- Paste the result back into Grammarly's editor and check the AI detection flag
- Do a final pass for tone before you send or publish
Does Grammarly detect ChatGPT and Claude differently?
Both get flagged by the same underlying scoring, but not identically. Claude's writing tends to be more structurally uniform on average, which can push it slightly higher on Grammarly's AI likelihood, similar to what we found comparing Claude and ChatGPT against other detectors.
Verifying your result
Grammarly's detector, like every other one on this list, isn't infallible. If a result feels off, or you need real certainty for a client deliverable, cross-check with a second detector before you send anything out. RewriteMate shows an estimated score with every result, which is usually enough to catch a problem before Grammarly does. See our full comparison of AI humanizer tools if you want to weigh other options.
Ready to test a real draft? Try the free humanizer.
Frequently Asked Questions
Does Grammarly detect ChatGPT and Claude equally?
Both get flagged, but Claude's more uniform sentence structure tends to score slightly higher on average, similar to what we found testing Claude vs ChatGPT on other detectors.
Can Grammarly's AI detector be wrong?
Yes. Like other detectors, it can flag formulaic human writing, especially business or academic writing that follows a template closely.
What Grammarly AI score is acceptable for work submissions?
That depends on your employer's or client's policy, most treat a low score as acceptable, but there's no single universal threshold.
What's the fastest way to pass Grammarly AI detection?
Run your draft through RewriteMate's Professional mode first, then check it in Grammarly, most flagged business writing clears on the first pass.
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