AI Humanizer BenchmarkLeaderboard / Compare / SmartHumanizer vs StealthGPT
Head to head · September 2026 cycle
SmartHumanizer vs StealthGPT
SmartHumanizer finished 12.9 points ahead of StealthGPT in the September 2026 cycle, 84.80 to 71.90, ranking #2 against #7 in a field of 11. SmartHumanizer scored higher on 4 of 7 detectors and 6 of 7 writing categories. StealthGPT came out ahead on Readability (82.7 vs 75.7), Copyleaks (57.6 vs 15.2), Winston AI (62.1 vs 51.0). The bypass-rate gap, 74.6 to 85.3, sits inside both tools' 95% confidence intervals, so treat bypass as a draw.
- Detectors
- 4 – 3
- Categories
- 6 – 1
- Components
- 4 – 1
- Last tested
- 2026-09-03
- Prompts
- 33
- Methodology
- v1.0.0
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' 95% confidence intervals for bypass rate; it may not survive another cycle.
Detector by detector
Share of each tool's outputs that a detector classified as human-written. SmartHumanizer took 4 of 7.
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.
Where each one wins
Every measure above that one tool won outright, largest margin first within each group.
SmartHumanizer
14 wins- Meaning preservation Score87.6 vs 70.1
- Bypass rate Score85.3 vs 74.6
- Consistency Score88.3 vs 78.5
- Penalties ScoreNone vs −3.0
- Originality.ai Detector78.2 vs 48.2
- QuillBot Detector94.2 vs 66.0
- ZeroGPT Detector82.6 vs 66.5
- Grammarly Detector86.9 vs 77.5
- Discussion board Category88.3 vs 57.2
- Application essay Category83.3 vs 66.5
- News article Category79.3 vs 68.8
- Academic essay Category89.8 vs 80.0
- Blog post Category82.4 vs 76.6
- Marketing copy Category89.2 vs 85.0
StealthGPT
5 wins- Readability Score82.7 vs 75.7
- Copyleaks Detector57.6 vs 15.2
- Winston AI Detector62.1 vs 51.0
- GPTZero Detector78.2 vs 71.0
- Business email Category81.3 vs 75.6
Questions people ask
Is SmartHumanizer better than StealthGPT?
SmartHumanizer finished 12.9 points ahead of StealthGPT in the September 2026 cycle, 84.80 to 71.90, ranking #2 against #7 in a field of 11. SmartHumanizer scored higher on 4 of 7 detectors and 6 of 7 writing categories. Both tools ran the same 33 prompts, scored by the same 7 detectors, under methodology v1.0.0; every input, output, and verdict is published.
Which bypasses AI detectors better, SmartHumanizer or StealthGPT?
SmartHumanizer posted the higher bypass rate, 85.3 vs 74.6, and scored higher on 4 of 7 detectors. SmartHumanizer led on Originality.ai, ZeroGPT, Grammarly and QuillBot; StealthGPT led on GPTZero, Winston AI and Copyleaks. The overall bypass gap is inside both 95% confidence intervals, so it is not a reliable difference.
Do SmartHumanizer and StealthGPT keep the original meaning?
SmartHumanizer preserved meaning better, 87.6 vs 70.1 on our 0–100 similarity scale. On readability, StealthGPT rated higher, 82.7 vs 75.7. Penalties this cycle: SmartHumanizer None, StealthGPT −3.0.