HumanizerEval

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September 2026 review · same 50 texts

Undetectable.ai vs Humbot

In the September 2026 HumanizerEval review, Undetectable.ai and Humbot rewrote the same 50 English texts. Undetectable.ai cleared all 5 detectors on 15 of them; Humbot on 0. The difference is mostly GPTZero: on 17 samples Undetectable.ai passed it where Humbot 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 4.0Undetectable.ai16 to 0034
GPTZero 2026-09-13-baseUndetectable.ai17 to 0312
Originality.ai turboUndetectable.ai13 to 1342
ZeroGPT defaultTied0 to 0500
Winston AI 5.0Humbot1 to 0490
All 5 detectorsUndetectable.ai15 to 0035

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 34 of 50 here.

Quality and output discipline

Quality and output discipline, September 2026.
MeasureUndetectable.aiHumbot
26%22%
28%0%
94%98%
78%70%
1.211.12
70
00
University / General Writing / More Human, v11srAdvanced
Websiteundetectable.ai humbot.ai

On per-sample quality scores, Undetectable.ai scored higher on 17 samples, Humbot on 8, and the two tied on 25. Humbot’s output was shorter on 33 of 50 samples; mean length ratios were 1.21 and 1.12, or 21% longer than the input and 12% longer than the input respectively.

Where each one outperforms the other

Undetectable.ai

  • Pangram: passed 16 of 50 against 0, including 16 samples where Humbot failed, against 0 the other way.
  • GPTZero: passed 48 of 50 against 31, including 17 samples where Humbot failed, against 0 the other way.
  • Originality.ai: passed 47 of 50 against 35, including 13 samples where Humbot failed, against 1 the other way.
  • Factual consistency: 26% against 22%.
  • Naturalness: 28% against 0%.
  • Stance preservation: 78% against 70%.

Humbot

  • Originality.ai: passed 1 sample where Undetectable.ai failed, even though it was detected more often overall, passing 35 to 47.
  • ZeroGPT: tied at 50 of 50 but on a higher mean human score, 96.7% to 95.0%. It passed 0 samples where Undetectable.ai failed.
  • Winston AI: passed 50 of 50 against 49, including 1 sample where Undetectable.ai failed, against 0 the other way.
  • Syntax integrity: 98% against 94%.
  • Length: shorter output on 33 of 50 samples, which matters under a word limit.

Undetectable.ai vs Humbot FAQ

Is Undetectable.ai better than Humbot?

In the September 2026 HumanizerEval review, Undetectable.ai cleared all 5 detectors on 15 of the 50 shared samples and Humbot on 0. On ZeroGPT and Winston AI the two were within 6 points of each other. Quality ran 17 samples to 8, with 25 ties.

Which humanizer is best for Pangram, Undetectable.ai or Humbot?

Undetectable.ai. In September 2026, Undetectable.ai passed Pangram on 16 of the 50 shared samples and Humbot on 0. On 16 samples Undetectable.ai passed where Humbot failed; the reverse never happened. Both failed on 34.

Which humanizer changes the text less?

Undetectable.ai. It scored higher on per-sample quality on 17 of 50 samples, against 8. Undetectable.ai’s outputs averaged 1.21× the input length and passed factual consistency on 26%; Humbot’s averaged 1.12× and passed on 22%. On stance preservation the split was 78% to 70%. Humbot produced the shorter output on 33 of 50 samples.

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