HumanizerEval

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September 2026 review · same 50 texts

Rephrasy vs BypassGPT

In the September 2026 HumanizerEval review, Rephrasy and BypassGPT rewrote the same 50 English texts. Rephrasy cleared all 5 detectors on 20 of them; BypassGPT on 0. The difference is mostly Pangram: on 23 samples Rephrasy passed it where BypassGPT failed, and the reverse never happened. On ZeroGPT and 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 4.0Rephrasy23 to 0027
GPTZero 2026-09-13-baseRephrasy16 to 0286
Originality.ai turboRephrasy13 to 3304
ZeroGPT defaultTied0 to 0500
Winston AI 5.0Tied0 to 0500
All 5 detectorsRephrasy20 to 0030

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 27 of 50 here.

Quality and output discipline

Quality and output discipline, September 2026.
MeasureRephrasyBypassGPT
36%22%
30%2%
92%94%
60%78%
1.131.12
30
00
v4Enhanced
Websiterephrasy.ai bypassgpt.ai

On per-sample quality scores, Rephrasy scored higher on 22 samples, BypassGPT on 13, and the two tied on 15. Rephrasy’s output was shorter on 30 of 50 samples; mean length ratios were 1.13 and 1.12, or 13% longer than the input and 12% longer than the input respectively.

Where each one outperforms the other

Rephrasy

  • Pangram: passed 23 of 50 against 0, including 23 samples where BypassGPT failed, against 0 the other way.
  • GPTZero: passed 44 of 50 against 28, including 16 samples where BypassGPT failed, against 0 the other way.
  • Originality.ai: passed 43 of 50 against 33, including 13 samples where BypassGPT failed, against 3 the other way.
  • Winston AI: tied at 50 of 50 but on a higher mean human score, 98.8% to 98.0%. It passed 0 samples where BypassGPT failed.
  • Factual consistency: 36% against 22%.
  • Naturalness: 30% against 2%.
  • Length: shorter output on 30 of 50 samples, which matters under a word limit.

BypassGPT

  • Originality.ai: passed 3 samples where Rephrasy failed, even though it was detected more often overall, passing 33 to 43.
  • ZeroGPT: tied at 50 of 50 but on a higher mean human score, 97.2% to 92.7%. It passed 0 samples where Rephrasy failed.
  • Syntax integrity: 94% against 92%.
  • Stance preservation: 78% against 60%.

Rephrasy vs BypassGPT FAQ

Is Rephrasy better than BypassGPT?

In the September 2026 HumanizerEval review, Rephrasy cleared all 5 detectors on 20 of the 50 shared samples and BypassGPT on 0. On ZeroGPT and Winston AI the two were within 6 points of each other. Quality ran 22 samples to 13, with 15 ties.

Which humanizer is best for Pangram, Rephrasy or BypassGPT?

Rephrasy. In September 2026, Rephrasy passed Pangram on 23 of the 50 shared samples and BypassGPT on 0. On 23 samples Rephrasy passed where BypassGPT failed; the reverse never happened. Both failed on 27.

Which humanizer changes the text less?

Rephrasy. It scored higher on per-sample quality on 22 of 50 samples, against 13. Rephrasy’s outputs averaged 1.13× the input length and passed factual consistency on 36%; BypassGPT’s averaged 1.12× and passed on 22%. On stance preservation the split was 60% to 78%. Rephrasy produced the shorter output on 30 of 50 samples.

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