Head to head · September 2026 cycle
AI Humanize io vs StealthGPT
AI Humanize io finished 7.8 points ahead of StealthGPT in the September 2026 cycle, 72.94 to 65.10, ranking #4 against #9 in a field of 14. AI Humanize io scored higher on 3 of 5 detectors and 7 of 7 writing categories. StealthGPT came out ahead on GPTZero (77.4 vs 55.8), Copyleaks (81.8 vs 60.6) and readability (70.9 vs 58.4). The bypass-rate gap, 81.5 to 79.6, sits inside both tools' 95% confidence intervals, so treat bypass as a draw.
- Detectors
- 3 – 2
- Categories
- 7 – 0
- Components
- 4 – 1
Score components
What the overall score is made of: bypass rate weighs 42%, meaning preservation 32%, readability 16%, consistency across categories 10%. Output-quality penalties come off the total. How scoring works →
CIs overlap marks a gap that sits inside both tools' published 95% confidence intervals for that component; it may not survive another cycle.
Detector by detector
Share of each tool's outputs that a detector classified as human-written. AI Humanize io took 3 of 5.
Writing categories
Category score per writing context: bypass credit only for real rewrites, blended with the category's own meaning preservation and readability. Small categories swing; the prompt count is shown on each row. How category scores work →
Head-to-head history
Overall score in every cycle both tools were tested. AI Humanize io has finished ahead in 3 of 4 shared cycles.
| Cycle | AI Humanize io | StealthGPT | Margin |
|---|---|---|---|
| September 2026 | 72.94 #4 | 65.10 #9 | ← 7.8 |
| August 2026 | 64.57 #6 | 45.55 #12 | ← 19.0 |
| July 2026 | 59.66 #10 | 61.52 #8 | → 1.9 |
| June 2026 | 72.95 #6 | 71.47 #7 | ← 1.5 |
Where each one wins
Every measure above that one tool won outright, largest margin first within each group.
AI Humanize io
14 wins- Penalties Score −1.0 vs −5.0
- Meaning preservation Score 73.2 vs 59.4
- Consistency Score 69.2 vs 63.1
- Bypass rate Score 81.5 vs 79.6
- Winston AI Detector 79.0 vs 66.6
- ZeroGPT Detector 75.0 vs 68.9
- Originality.ai Detector 93.3 vs 89.5
- Blog Post Category 80.9 vs 60.7
- Marketing Copy Category 82.4 vs 73.1
- Application Essay Category 68.0 vs 60.3
- and 4 more
StealthGPT
3 wins- Readability Score 70.9 vs 58.4
- GPTZero Detector 77.4 vs 55.8
- Copyleaks Detector 81.8 vs 60.6
Questions people ask
Is AI Humanize io better than StealthGPT?
AI Humanize io finished 7.8 points ahead of StealthGPT in the September 2026 cycle, 72.94 to 65.10, ranking #4 against #9 in a field of 14. AI Humanize io scored higher on 3 of 5 detectors and 7 of 7 writing categories. Both tools ran the same 33 prompts, scored by the same 5 detectors, under methodology v1.2.0; every input, output and verdict is published.
Which bypasses AI detectors better, AI Humanize io or StealthGPT?
AI Humanize io posted the higher bypass rate, 81.5 vs 79.6, and scored higher on 3 of 5 detectors. AI Humanize io led on Originality.ai, Winston AI and ZeroGPT; StealthGPT led on GPTZero and Copyleaks. The overall bypass gap is inside both 95% confidence intervals, so it is not a reliable difference.
Do AI Humanize io and StealthGPT keep the original meaning?
AI Humanize io preserved meaning better, 73.2 vs 59.4 on our 0–100 similarity scale. On readability, StealthGPT rated higher, 70.9 vs 58.4. Penalties this cycle: AI Humanize io −1.0, StealthGPT −5.0.