Head to head · September 2026 cycle
StealthGPT vs SupWriter
SupWriter finished 7.7 points ahead of StealthGPT in the September 2026 cycle, 72.80 to 65.10, ranking #5 against #9 in a field of 14. SupWriter scored higher on 3 of 5 detectors and 6 of 7 writing categories. StealthGPT came out ahead on GPTZero (77.4 vs 21.0), readability (70.9 vs 45.7) and Originality.ai (89.5 vs 78.5). The bypass-rate gap, 79.6 to 80.3, sits inside both tools' 95% confidence intervals, so treat bypass as a draw.
- Detectors
- 2 – 3
- Categories
- 1 – 6
- 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. SupWriter 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 →
Where each one wins
Every measure above that one tool won outright, largest margin first within each group.
StealthGPT
4 wins- Readability Score 70.9 vs 45.7
- GPTZero Detector 77.4 vs 21.0
- Originality.ai Detector 89.5 vs 78.5
- Business Email Category 42.7 vs 38.7
SupWriter
13 wins- Penalties Score None vs −5.0
- Meaning preservation Score 79.0 vs 59.4
- Consistency Score 64.7 vs 63.1
- Bypass rate Score 80.3 vs 79.6
- Winston AI Detector 81.5 vs 66.6
- ZeroGPT Detector 77.9 vs 68.9
- Copyleaks Detector 85.3 vs 81.8
- Discussion Board Category 78.0 vs 60.1
- Blog Post Category 78.4 vs 60.7
- News Article Category 81.1 vs 64.9
- and 3 more
Questions people ask
Is StealthGPT better than SupWriter?
SupWriter finished 7.7 points ahead of StealthGPT in the September 2026 cycle, 72.80 to 65.10, ranking #5 against #9 in a field of 14. SupWriter scored higher on 3 of 5 detectors and 6 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, StealthGPT or SupWriter?
SupWriter posted the higher bypass rate, 80.3 vs 79.6, and scored higher on 3 of 5 detectors. StealthGPT led on GPTZero and Originality.ai; SupWriter led on Copyleaks, Winston AI and ZeroGPT. The overall bypass gap is inside both 95% confidence intervals, so it is not a reliable difference.
Do StealthGPT and SupWriter keep the original meaning?
SupWriter preserved meaning better, 79.0 vs 59.4 on our 0–100 similarity scale. On readability, StealthGPT rated higher, 70.9 vs 45.7. Penalties this cycle: StealthGPT −5.0, SupWriter None.