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October 2026 review · same 50 texts

Rephrasy vs Grubby

In the October 2026 HumanizerEval review, Rephrasy and Grubby rewrote the same 50 English texts. Rephrasy cleared all 6 detectors on 0 of them; Grubby on 0. The difference is mostly Pangram: on 9 samples Rephrasy passed it where Grubby failed, and the reverse happened on 1. On GPTZero, Originality.ai 5.0, ZeroGPT and Winston AI the two were close to even.

Per-sample agreement

Per-sample agreement, October 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 4.1Rephrasy9 to 1436
GPTZero 2026-10-07-baseRephrasy6 to 52910
Originality.ai TurboGrubby7 to 0430
Originality.ai 5.0 model-5.0Tied0 to 0050
ZeroGPT defaultGrubby3 to 1451
Winston AI 5.0Tied0 to 0500
All 6 detectorsTied0 to 0050

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, October 2026.
MeasureRephrasyGrubby
32%76%
44%64%
98%100%
62%78%
1.221.19
51
00
v4Academic
Websiterephrasy.ai grubby.ai

On per-sample quality scores, Rephrasy scored higher on 7 samples, Grubby on 32, and the two tied on 11. Rephrasy’s output was shorter on 30 of 50 samples; mean length ratios were 1.22 and 1.19, or 22% longer than the input and 19% longer than the input respectively.

Where each one outperforms the other

Rephrasy

  • Pangram: passed 13 of 50 against 5, including 9 samples where Grubby failed, against 1 the other way.
  • GPTZero: passed 35 of 50 against 34, including 6 samples where Grubby failed, against 5 the other way.
  • Originality.ai 5.0: tied at 0 of 50 but on a higher mean human score, 19.4% to 9.8%. It passed 0 samples where Grubby failed.
  • ZeroGPT: passed 1 sample where Grubby failed, even though it was detected more often overall, passing 46 to 48.
  • Length: shorter output on 30 of 50 samples, which matters under a word limit.

Grubby

  • Pangram: passed 1 sample where Rephrasy failed, even though it was detected more often overall, passing 5 to 13.
  • GPTZero: passed 5 samples where Rephrasy failed, even though it was detected more often overall, passing 34 to 35.
  • Originality.ai Turbo: passed 50 of 50 against 43, including 7 samples where Rephrasy failed, against 0 the other way.
  • ZeroGPT: passed 48 of 50 against 46, including 3 samples where Rephrasy failed, against 1 the other way.
  • Winston AI: tied at 50 of 50 but on a higher mean human score, 99.7% to 98.4%. It passed 0 samples where Rephrasy failed.
  • Factual consistency: 76% against 32%.
  • Naturalness: 64% against 44%.
  • Syntax integrity: 100% against 98%.
  • Stance preservation: 78% against 62%.

Rephrasy vs Grubby FAQ

Is Rephrasy better than Grubby?

In the October 2026 HumanizerEval review, Rephrasy cleared all 6 detectors on 0 of the 50 shared samples and Grubby on 0. On GPTZero, Originality.ai 5.0, ZeroGPT and Winston AI the two were within 6 points of each other. Quality ran 7 samples to 32, with 11 ties.

Which humanizer is best for Pangram, Rephrasy or Grubby?

Rephrasy. In October 2026, Rephrasy passed Pangram on 13 of the 50 shared samples and Grubby on 5. On 9 samples Rephrasy passed where Grubby failed; the reverse happened on 1. Both failed on 36.

Which humanizer changes the text less?

Grubby. It scored higher on per-sample quality on 32 of 50 samples, against 7. Rephrasy’s outputs averaged 1.22× the input length and passed factual consistency on 32%; Grubby’s averaged 1.19× and passed on 76%. On stance preservation the split was 62% to 78%. Rephrasy produced the shorter output on 30 of 50 samples.

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