Leaderboard / Humanizers / RewriteAI

September 2026 review · rank 6 of 10

RewriteAI AI detector test results

In the September 2026 HumanizerEval review, RewriteAI ranked 6 of 10 with a mean strict-bypass rate of 77.2%, behind StealthGPT Super at 96.8%. It cleared all 5 detectors on 13 of 50 texts. Review our full results for the best AI humanizer on the leaderboard page.

RewriteAI results, September 2026

Website

rewriteai.com

Rank

6 of 10

Mean strict bypassThe average of the five detector pass rates: the share of texts each detector called human-written. The leaderboard is ranked by this number.

77.2%

Passed all 5 detectorsTexts that all five detectors called human-written.

13 of 50

Pangram 4.0 strict bypassHow many texts Pangram called human-written (a human score above 50%), with the mean and median human score it gave across all texts.

14 of 50 (28%), mean 29.6%, median 0%

GPTZero 2026-09-13-base strict bypassHow many texts GPTZero called human-written (a human score above 50%), with the mean and median human score it gave across all texts.

43 of 50 (86%), mean 83.3%, median 100%

Originality.ai turbo strict bypassHow many texts Originality.ai called human-written (a human score above 50%), with the mean and median human score it gave across all texts.

44 of 50 (88%), mean 91.3%, median 99.99%

ZeroGPT default strict bypassHow many texts ZeroGPT called human-written (a human score above 50%), with the mean and median human score it gave across all texts.

44 of 50 (88%), mean 77.3%, median 86.95%

Winston AI 5.0 strict bypassHow many texts Winston AI called human-written (a human score above 50%), with the mean and median human score it gave across all texts.

48 of 50 (96%), mean 95.4%, median 99.69%

Factual consistency passShare of outputs where key claims, numbers, citations, and named entities remain accurate and correctly attributed.

54%

Naturalness passShare of outputs where wording is fluent and free of awkward or clunky phrasing.

40%

Syntax integrity passShare of outputs where sentences are grammatically complete and free of disruptive run-ons or punctuation errors.

100%

Stance preservation passShare of outputs where the source's position, tone, and intent are not reversed or distorted.

94%

Mean length ratioOutput word count divided by input word count, averaged across texts. 1.00 is the same length; 1.10 is 10% longer.

1.09

Samples over 1.4× inputOutputs more than 1.4× the input’s word count.

2

Samples under 0.6× inputOutputs shorter than 0.6× the input’s word count.

0

Settings usedThe mode each tool ran on: its strongest advertised setting on the cheapest paid tier.

API default, passages of up to 280 words (300-word API limit)

Recompute any of this from scores.csv. Strict bypass means an overall human verdict on a human score above 50%.

What the vendor claims, and what we measured

Claim

“AI Detection Resistance: 99%. Ability to bypass advanced AI detectors.” (rewriteai.com , retrieved October 1, 2026)

Measured

Strict bypass in September 2026: Pangram 28%, GPTZero 86%, Originality.ai 88%, ZeroGPT 88%, Winston AI 96%.

Verdict

Not verified. Mean strict bypass was 77.2% in September 2026, against the 99% claimed.

Review history

Head to head

Because every tool saw the same texts, these pages report per-sample agreement, how often each tool bypassed detection on the same input, rather than a difference of averages.

• RewriteAI vs StealthGPT

  RewriteAI cleared all 5 detectors on 0 samples where StealthGPT did not; the reverse happened on 33. Both cleared 13.

• RewriteAI vs WriteHuman

  RewriteAI cleared all 5 detectors on 1 sample where WriteHuman did not; the reverse happened on 21. Both cleared 11.

• RewriteAI vs Grubby

  RewriteAI cleared all 5 detectors on 5 samples where Grubby did not; the reverse happened on 10. Both cleared 8.

• RewriteAI vs Rephrasy

  RewriteAI cleared all 5 detectors on 4 samples where Rephrasy did not; the reverse happened on 11. Both cleared 9.

• RewriteAI vs Undetectable.ai

  RewriteAI cleared all 5 detectors on 6 samples where Undetectable.ai did not; the reverse happened on 8. Both cleared 7.

• RewriteAI vs HIX Bypass

  RewriteAI cleared all 5 detectors on 12 samples where HIX Bypass did not; the reverse never happened. Both cleared 1.

• RewriteAI vs Humbot

  RewriteAI cleared all 5 detectors on 13 samples where Humbot did not; the reverse never happened. Both cleared 0.

• RewriteAI vs BypassGPT

  RewriteAI cleared all 5 detectors on 13 samples where BypassGPT did not; the reverse never happened. Both cleared 0.

• RewriteAI vs Ryne

  RewriteAI cleared all 5 detectors on 13 samples where Ryne did not; the reverse never happened. Both cleared 0.