September 2026 review · Winston AI 5.0
Best AI humanizer for Winston AI
In the September 2026 HumanizerEval review, 5 tools tied for the best Winston AI 5.0 result, passing 100% 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.
Winston AI results, September 2026
| Humanizer | Strict bypass | Texts passed | Mean human score | Median human score |
|---|---|---|---|---|
| WriteHuman | 100% | 49 of 49 | 99.8% | 99.83% |
| Grubby | 100% | 50 of 50 | 99.3% | 99.85% |
| Rephrasy | 100% | 50 of 50 | 98.8% | 99.78% |
| BypassGPT | 100% | 50 of 50 | 98.0% | 99.63% |
| Humbot | 100% | 50 of 50 | 97.4% | 99.71% |
| StealthGPT Super | 98% | 49 of 50 | 97.7% | 99.81% |
| Undetectable.ai | 98% | 49 of 50 | 97.5% | 99.84% |
| HIX Bypass | 98% | 49 of 50 | 96.4% | 99.79% |
| RewriteAI | 96% | 48 of 50 | 95.4% | 99.69% |
| Ryne | 26% | 13 of 50 | 26.3% | 0.39% |
What is Winston AI?
Winston AI Inc. is based in Montreal, was founded in 2022 and was co-founded by Thierry Lavergne. Its Model 4.0, Curia, was released February 17, 2025; the company says it was trained and tested on outputs from 12 LLMs and scored 99.95% overall on a 10,000-sample English dataset generated in February 2025. It says its algorithms are updated weekly.
Winston cites a peer-reviewed study in Information Research reporting 99% accuracy against three other detectors, a 2026 Nature Human Behaviour paper by researchers at Yale, Northeastern and two Hong Kong universities that used Winston to classify 1.1 million U.S. consumer complaints, and a first-place ranking on the crowdsourced DetectArena benchmark as of August 20, 2026.
Winston was not included in the Jabarian and Imas study, and names no institutional customers on its site; its testimonials come from individual teachers, editors and a school district manager.
Who uses it. Individual educators, editors and small institutions, per the vendor’s own testimonials.
How Winston AI compares with the rest of the panel
Across the 10 tools tested in September 2026, the average strict-bypass rate on Winston AI was 92%, against 32% on Pangram, 76% on GPTZero, 76% on Originality.ai and 95% on ZeroGPT, on the same texts.
Sources
- Winston AI model 4.0 release
- HumanizerEval September 2026 review archive: frozen results and downloads
Winston AI FAQ
Which AI humanizer is best for Winston AI?
In September 2026, 5 tools tied for the best Winston AI 5.0 result, passing 100% of texts.
Does Grubby bypass Winston AI?
Yes. In September 2026, Grubby passed Winston AI 5.0 on 50 of 50 texts (100%). Its mean human score was 99.3% and its median was 99.85%.
Does Rephrasy bypass Winston AI?
Yes. In September 2026, Rephrasy passed Winston AI 5.0 on 50 of 50 texts (100%). Its mean human score was 98.8% and its median was 99.78%.
Does BypassGPT bypass Winston AI?
Yes. In September 2026, BypassGPT passed Winston AI 5.0 on 50 of 50 texts (100%). Its mean human score was 98.0% and its median was 99.63%.
Does Humbot bypass Winston AI?
Yes. In September 2026, Humbot passed Winston AI 5.0 on 50 of 50 texts (100%). Its mean human score was 97.4% and its median was 99.71%.
Does StealthGPT Super bypass Winston AI?
Yes. In September 2026, StealthGPT Super passed Winston AI 5.0 on 49 of 50 texts (98%). Its mean human score was 97.7% and its median was 99.81%.
Does Undetectable.ai bypass Winston AI?
Yes. In September 2026, Undetectable.ai passed Winston AI 5.0 on 49 of 50 texts (98%). Its mean human score was 97.5% and its median was 99.84%.
Does HIX Bypass bypass Winston AI?
Yes. In September 2026, HIX Bypass passed Winston AI 5.0 on 49 of 50 texts (98%). Its mean human score was 96.4% and its median was 99.79%.
Does RewriteAI bypass Winston AI?
Yes. In September 2026, RewriteAI passed Winston AI 5.0 on 48 of 50 texts (96%). Its mean human score was 95.4% and its median was 99.69%.
Does Ryne bypass Winston AI?
No. In September 2026, Ryne passed Winston AI 5.0 on 13 of 50 texts (26%). Its mean human score was 26.3% and its median was 0.39%.
Is Winston 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.