October 2026 review · Originality.ai 5.0 model-5.0
Best AI humanizer for Originality.ai 5.0
In the October 2026 HumanizerEval review, StealthGPT had the best Originality.ai 5.0 model-5.0 result, passing 34% of texts. All 11 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 5.0 results, October 2026
| Humanizer | Strict bypass | Texts passed | Mean human score | Median human score |
|---|---|---|---|---|
| StealthGPT | 34% | 17 of 50 | 38.7% | 12% |
| WriteHuman | 6% | 3 of 50 | 16.9% | 12% |
| Undetectable.ai | 4% | 2 of 50 | 17.2% | 10% |
| Rephrasy | 0% | 0 of 50 | 19.4% | 13.5% |
| Grubby | 0% | 0 of 50 | 9.8% | 8% |
| Phrasly | 0% | 0 of 50 | 9.4% | 8% |
| Humbot | 0% | 0 of 50 | 6.9% | 6% |
| HIX Bypass | 0% | 0 of 50 | 6.8% | 6% |
| BypassGPT | 0% | 0 of 50 | 6.8% | 6% |
| RewriteAI | 0% | 0 of 50 | 4.9% | 5% |
| Ryne | 0% | 0 of 50 | 4.2% | 4% |
| Source textNo humanizer | 0% | 0 of 50 | 3.1% | 3% |
Vendor verdicts
| Humanizer | Likely Original | Mixed | Likely AI |
|---|---|---|---|
| StealthGPT | 30% | 12% | 58% |
| Undetectable.ai | 0% | 26% | 74% |
| WriteHuman | 0% | 24% | 76% |
| Rephrasy | 0% | 46% | 54% |
| Grubby | 0% | 6% | 94% |
| RewriteAI | 0% | 0% | 100% |
| Phrasly | 0% | 8% | 92% |
| HIX Bypass | 0% | 0% | 100% |
| Humbot | 0% | 2% | 98% |
| BypassGPT | 0% | 2% | 98% |
| Ryne | 0% | 0% | 100% |
| Source text | 0% | 0% | 100% |
What is Originality.ai 5.0?
Originality.ai 5.0 is a separate model from Turbo. It reports the share of the text it judges AI-written, rather than a confidence score, so its human score is not comparable with Turbo.
A strict bypass on this page is still a human score above 50%: the model judged less than half of the text to be AI-written. The review also records the vendor labels Likely Original, Mixed, and Likely AI. Mixed does not count as a bypass.
How Originality.ai 5.0 compares with the rest of the panel
Across the 11 tools tested in October 2026, the average strict-bypass rate on Originality.ai 5.0 was 4%, against 18% on Pangram, 47% on GPTZero, 77% on Originality.ai Turbo, 83% on ZeroGPT and 89% on Winston AI, on the same texts.
Sources
- Originality.ai
- HumanizerEval October 2026 review archive: frozen results and downloads
Originality.ai 5.0 FAQ
Which AI humanizer is best for Originality.ai 5.0?
In October 2026, StealthGPT had the best Originality.ai 5.0 model-5.0 result, passing 34% of texts. The next best was WriteHuman, passing 3 of 50 texts (6%).
Does WriteHuman bypass Originality.ai 5.0?
No. In October 2026, WriteHuman passed Originality.ai 5.0 model-5.0 on 3 of 50 texts (6%). Its mean human score was 16.9% and its median was 12%.
Does Undetectable.ai bypass Originality.ai 5.0?
No. In October 2026, Undetectable.ai passed Originality.ai 5.0 model-5.0 on 2 of 50 texts (4%). Its mean human score was 17.2% and its median was 10%.
Does Rephrasy bypass Originality.ai 5.0?
No. In October 2026, Rephrasy passed Originality.ai 5.0 model-5.0 on 0 of 50 texts (0%). Its mean human score was 19.4% and its median was 13.5%.
Does Grubby bypass Originality.ai 5.0?
No. In October 2026, Grubby passed Originality.ai 5.0 model-5.0 on 0 of 50 texts (0%). Its mean human score was 9.8% and its median was 8%.
Does Phrasly bypass Originality.ai 5.0?
No. In October 2026, Phrasly passed Originality.ai 5.0 model-5.0 on 0 of 50 texts (0%). Its mean human score was 9.4% and its median was 8%.
Does Humbot bypass Originality.ai 5.0?
No. In October 2026, Humbot passed Originality.ai 5.0 model-5.0 on 0 of 50 texts (0%). Its mean human score was 6.9% and its median was 6%.
Does HIX Bypass bypass Originality.ai 5.0?
No. In October 2026, HIX Bypass passed Originality.ai 5.0 model-5.0 on 0 of 50 texts (0%). Its mean human score was 6.8% and its median was 6%.
Does BypassGPT bypass Originality.ai 5.0?
No. In October 2026, BypassGPT passed Originality.ai 5.0 model-5.0 on 0 of 50 texts (0%). Its mean human score was 6.8% and its median was 6%.
Does RewriteAI bypass Originality.ai 5.0?
No. In October 2026, RewriteAI passed Originality.ai 5.0 model-5.0 on 0 of 50 texts (0%). Its mean human score was 4.9% and its median was 5%.
Does Ryne bypass Originality.ai 5.0?
No. In October 2026, Ryne passed Originality.ai 5.0 model-5.0 on 0 of 50 texts (0%). Its mean human score was 4.2% and its median was 4%.
Is Originality.ai 5.0 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.