HumanizerEval, October 2026 review
Best AI detectors for humanized text (October 2026)
HumanizerEval's October 2026 review ran 11 AI humanizers on the same 50 texts and scored every output with 6 AI detectors. Here those detectors are ranked by how often the humanized text failed to pass them, meaning it didn't get a human score above 50%.
Disclosure: HumanizerEval is built by the StealthGPT team, and StealthGPT is one of the humanizers it ranks. Its per-sample scores are public, so you can check the results yourself at humanizereval.com.
This is not an accuracy score
The test had no human-written texts, so it says nothing about false positives, and these rates can't be compared with the accuracy figures detector vendors publish. It shows one thing: how hard each detector was for humanized AI text to pass.
StealthGPT's own AI detector wasn't part of the test, so it isn't ranked here.
October 2026 rankings
| Detector | Failed to pass | |
|---|---|---|
| 1Originality.ai 5.0API setting: model-5.0 | 96.0% | |
| 2PangramAPI setting: v4 | 82.2% | |
| 3GPTZeroAPI setting: latest | 53.3% | |
| 4Originality.ai TurboAPI setting: turbo | 23.3% | |
| 5ZeroGPTAPI setting: default | 17.1% | |
| 6Winston AIAPI setting: latest | 11.3% | |
Failed to pass is 100% minus the detector's mean pass rate across all 11 humanizers, 50 texts each. A fail is any output with a human score of 50% or lower, whatever label the vendor gave it.
What the ranking shows
Originality.ai 5.0 was the hardest to pass: 96.0% of humanized outputs failed it. The best result any humanizer got on it was 34%, by StealthGPT Super.
Winston AI was the easiest, failing 11.3% of the same outputs. Detectors disagree this much on identical text, which is why HumanizerEval keeps each detector's scores separate. A humanizer that passes one detector can fail another.
Not in the test
Turnitin has no public API at the volume a benchmark needs, so it isn't in the panel. Copyleaks is a candidate for a later review. Neither is ranked here.