Head to head · September 2026 cycle
StealthBypass vs Undetectable.ai
Undetectable.ai finished 32.4 points ahead of StealthBypass in the September 2026 cycle, 71.75 to 39.38, ranking #6 against #13 in a field of 14. Undetectable.ai scored higher on 4 of 5 detectors and 7 of 7 writing categories. StealthBypass came out ahead on consistency across categories (80.7 vs 71.1) and ZeroGPT (84.4 vs 80.4). The bypass-rate gap, 78.6 to 82.1, sits inside both tools' 95% confidence intervals, so treat bypass as a draw.
- Detectors
- 1 – 4
- Categories
- 0 – 7
- Components
- 1 – 4
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. Undetectable.ai took 4 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 →
Where each one wins
Every measure above that one tool won outright, largest margin first within each group.
StealthBypass
2 wins- Consistency Score 80.7 vs 71.1
- ZeroGPT Detector 84.4 vs 80.4
Undetectable.ai
15 wins- Penalties Score −6.0 vs −23.0
- Meaning preservation Score 82.1 vs 39.5
- Readability Score 61.7 vs 54.1
- Bypass rate Score 82.1 vs 78.6
- Originality.ai Detector 91.7 vs 58.5
- Winston AI Detector 78.9 vs 56.3
- Copyleaks Detector 74.3 vs 65.1
- GPTZero Detector 72.4 vs 69.3
- Marketing Copy Category 78.4 vs 18.9
- Application Essay Category 73.8 vs 24.5
- and 5 more
Questions people ask
Is StealthBypass better than Undetectable.ai?
Undetectable.ai finished 32.4 points ahead of StealthBypass in the September 2026 cycle, 71.75 to 39.38, ranking #6 against #13 in a field of 14. Undetectable.ai scored higher on 4 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, StealthBypass or Undetectable.ai?
Undetectable.ai posted the higher bypass rate, 82.1 vs 78.6, and scored higher on 4 of 5 detectors. StealthBypass led on ZeroGPT; Undetectable.ai led on GPTZero, Originality.ai, Copyleaks and Winston AI. The overall bypass gap is inside both 95% confidence intervals, so it is not a reliable difference.
Do StealthBypass and Undetectable.ai keep the original meaning?
Undetectable.ai preserved meaning better, 82.1 vs 39.5 on our 0–100 similarity scale. On readability, Undetectable.ai rated higher, 61.7 vs 54.1. Penalties this cycle: StealthBypass −23.0, Undetectable.ai −6.0.