September 2026 review · Originality.ai turbo
Best AI humanizer for Originality.ai
In the September 2026 HumanizerEval review, Grubby, StealthGPT Super and WriteHuman tied for the best Originality.ai turbo result, passing 98% of texts. All 10 tools rewrote the same 50 English texts, and every output went to every detector in the panel. Review our full results for the best AI humanizer on the leaderboard page.
Originality.ai results, September 2026
| Humanizer | Strict bypass | Texts passed | Mean human score | Median human score |
|---|---|---|---|---|
| Grubby | 98% | 49 of 50 | 98.2% | 100% |
| StealthGPT Super | 98% | 49 of 50 | 95.8% | 99.98% |
| WriteHuman | 98% | 48 of 49 | 96.1% | 99.98% |
| Undetectable.ai | 94% | 47 of 50 | 93.1% | 99.99% |
| RewriteAI | 88% | 44 of 50 | 91.3% | 99.99% |
| Rephrasy | 86% | 43 of 50 | 85.1% | 99.93% |
| Humbot | 70% | 35 of 50 | 69.1% | 72.15% |
| BypassGPT | 66% | 33 of 50 | 67.9% | 69.48% |
| HIX Bypass | 64% | 32 of 50 | 65.7% | 67.85% |
| Ryne | 0% | 0 of 50 | 2.1% | 0.13% |
What is Originality.ai?
Originality.ai was founded in November 2022 by Jon Gillham and is based in Collingwood, Ontario. Its detector is based on a modified version of the BERT model and is covered by U.S. Patent No. 12,253,988. The company sells several models; HumanizerEval calls Turbo.
The product is aimed at publishers, agencies and marketing teams more than classrooms. Its site shows logos for The Guardian, The New York Times, Reuters, Walmart, AT&T, Duke, Purdue and Harvard, and it offers a Moodle integration for education.
In the Jabarian and Imas study, Originality.ai kept false positives under 1% but missed roughly 10 to 40% of AI text depending on the generator, the highest false negative rate of the three commercial detectors tested.
Who uses it. Publishers, SEO agencies and content teams. Frequently used as a stand-in for Turnitin, which has no public API.
How Originality.ai compares with the rest of the panel
Across the 10 tools tested in September 2026, the average strict-bypass rate on Originality.ai was 76%, against 32% on Pangram, 76% on GPTZero, 95% on ZeroGPT and 92% on Winston AI, on the same texts.
Sources
- Originality.ai about page
- Jabarian & Imas, NBER working paper 34223
- HumanizerEval September 2026 review archive: frozen results and downloads
Originality.ai FAQ
Which AI humanizer is best for Originality.ai?
In September 2026, Grubby, StealthGPT Super and WriteHuman tied for the best Originality.ai turbo result, passing 98% of texts. The next best was Undetectable.ai, passing 47 of 50 texts (94%).
Does StealthGPT Super bypass Originality.ai?
Yes. In September 2026, StealthGPT Super passed Originality.ai turbo on 49 of 50 texts (98%). Its mean human score was 95.8% and its median was 99.98%.
Does WriteHuman bypass Originality.ai?
Yes. In September 2026, WriteHuman passed Originality.ai turbo on 48 of 49 texts (98%). Its mean human score was 96.1% and its median was 99.98%.
Does Undetectable.ai bypass Originality.ai?
Yes. In September 2026, Undetectable.ai passed Originality.ai turbo on 47 of 50 texts (94%). Its mean human score was 93.1% and its median was 99.99%.
Does RewriteAI bypass Originality.ai?
No. In September 2026, RewriteAI passed Originality.ai turbo on 44 of 50 texts (88%). Its mean human score was 91.3% and its median was 99.99%.
Does Rephrasy bypass Originality.ai?
No. In September 2026, Rephrasy passed Originality.ai turbo on 43 of 50 texts (86%). Its mean human score was 85.1% and its median was 99.93%.
Does Humbot bypass Originality.ai?
No. In September 2026, Humbot passed Originality.ai turbo on 35 of 50 texts (70%). Its mean human score was 69.1% and its median was 72.15%.
Does BypassGPT bypass Originality.ai?
No. In September 2026, BypassGPT passed Originality.ai turbo on 33 of 50 texts (66%). Its mean human score was 67.9% and its median was 69.48%.
Does HIX Bypass bypass Originality.ai?
No. In September 2026, HIX Bypass passed Originality.ai turbo on 32 of 50 texts (64%). Its mean human score was 65.7% and its median was 67.85%.
Does Ryne bypass Originality.ai?
No. In September 2026, Ryne passed Originality.ai turbo on 0 of 50 texts (0%). Its mean human score was 2.1% and its median was 0.13%.
Is Originality.ai more accurate than the other detectors?
No. HumanizerEval measures how often humanized text passes a detector, not how accurate that detector is on unmodified writing. Those are different questions. On accuracy, the Jabarian and Imas study (NBER working paper 34223) found Pangram near zero on both false positives and false negatives, GPTZero under 1% false positives, and Originality.ai missing 10 to 40% of AI text depending on the generator. Winston AI was not in that study.