HumanizerEval

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September 2026 review · same 50 texts

RewriteAI vs BypassGPT

In the September 2026 HumanizerEval review, RewriteAI and BypassGPT rewrote the same 50 English texts. RewriteAI cleared all 5 detectors on 13 of them; BypassGPT on 0. The difference is mostly GPTZero: on 15 samples RewriteAI passed it where BypassGPT failed, and the reverse never happened. On Winston AI the two were close to even.

Per-sample agreement

Per-sample agreement, September 2026. Counts are out of the 50 shared samples, computed at the 50% human-score threshold. Margin counts the samples only one tool passed, higher count first.
DetectorPassed more oftenMarginBoth passedNeither passed
Pangram 4.0RewriteAI14 to 0036
GPTZero 2026-09-13-baseRewriteAI15 to 0287
Originality.ai turboRewriteAI13 to 2314
ZeroGPT defaultBypassGPT6 to 0440
Winston AI 5.0BypassGPT2 to 0480
All 5 detectorsRewriteAI13 to 0037

Every count is computed from scores.csv at build time, not transcribed. “Neither passed” counts the texts that defeated both tools; on Pangram that was 36 of 50 here.

Quality and output discipline

Quality and output discipline, September 2026.
MeasureRewriteAIBypassGPT
54%22%
40%2%
100%94%
94%78%
1.091.12
20
00
API default, passages of up to 280 words (300-word API limit)Enhanced
Websiterewriteai.com bypassgpt.ai

On per-sample quality scores, RewriteAI scored higher on 31 samples, BypassGPT on 4, and the two tied on 15. RewriteAI’s output was shorter on 31 of 50 samples; mean length ratios were 1.09 and 1.12, or 9% longer than the input and 12% longer than the input respectively.

Where each one outperforms the other

RewriteAI

  • Pangram: passed 14 of 50 against 0, including 14 samples where BypassGPT failed, against 0 the other way.
  • GPTZero: passed 43 of 50 against 28, including 15 samples where BypassGPT failed, against 0 the other way.
  • Originality.ai: passed 44 of 50 against 33, including 13 samples where BypassGPT failed, against 2 the other way.
  • Factual consistency: 54% against 22%.
  • Naturalness: 40% against 2%.
  • Syntax integrity: 100% against 94%.
  • Stance preservation: 94% against 78%.
  • Length: shorter output on 31 of 50 samples, which matters under a word limit.

BypassGPT

  • Originality.ai: passed 2 samples where RewriteAI failed, even though it was detected more often overall, passing 33 to 44.
  • ZeroGPT: passed 50 of 50 against 44, including 6 samples where RewriteAI failed, against 0 the other way.
  • Winston AI: passed 50 of 50 against 48, including 2 samples where RewriteAI failed, against 0 the other way.

RewriteAI vs BypassGPT FAQ

Is RewriteAI better than BypassGPT?

In the September 2026 HumanizerEval review, RewriteAI cleared all 5 detectors on 13 of the 50 shared samples and BypassGPT on 0. On Winston AI the two were within 6 points of each other. Quality ran 31 samples to 4, with 15 ties.

Which humanizer is best for Pangram, RewriteAI or BypassGPT?

RewriteAI. In September 2026, RewriteAI passed Pangram on 14 of the 50 shared samples and BypassGPT on 0. On 14 samples RewriteAI passed where BypassGPT failed; the reverse never happened. Both failed on 36.

Which humanizer changes the text less?

RewriteAI. It scored higher on per-sample quality on 31 of 50 samples, against 4. RewriteAI’s outputs averaged 1.09× the input length and passed factual consistency on 54%; BypassGPT’s averaged 1.12× and passed on 22%. On stance preservation the split was 94% to 78%. RewriteAI produced the shorter output on 31 of 50 samples.

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