AI Humanizer BenchmarkLeaderboard / Compare / CleverHumanizer vs StealthGPT
Head to head · September 2026 cycle
CleverHumanizer vs StealthGPT
StealthGPT finished 5.1 points ahead of CleverHumanizer in the September 2026 cycle, 71.90 to 66.80, ranking #7 against #9 in a field of 11. StealthGPT scored higher on 1 of 7 detectors and 2 of 7 writing categories. CleverHumanizer came out ahead on Bypass rate (86.5 vs 74.6), Consistency (88.8 vs 78.5), QuillBot (88.8 vs 66.0). The bypass-rate gap, 86.5 to 74.6, sits inside both tools' 95% confidence intervals, so treat bypass as a draw.
- Detectors
- 6 – 1
- Categories
- 5 – 2
- Components
- 2 – 3
- 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. CleverHumanizer took 6 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.
CleverHumanizer
13 wins- Bypass rate Score86.5 vs 74.6
- Consistency Score88.8 vs 78.5
- QuillBot Detector88.8 vs 66.0
- Grammarly Detector96.9 vs 77.5
- Originality.ai Detector67.0 vs 48.2
- GPTZero Detector90.0 vs 78.2
- ZeroGPT Detector77.9 vs 66.5
- Winston AI Detector70.5 vs 62.1
- Discussion board Category77.6 vs 57.2
- News article Category82.9 vs 68.8
- Application essay Category71.7 vs 66.5
- Blog post Category81.5 vs 76.6
- Academic essay Category81.4 vs 80.0
StealthGPT
6 wins- Readability Score82.7 vs 73.2
- Penalties Score−3.0 vs −11.0
- Meaning preservation Score70.1 vs 65.3
- Copyleaks Detector57.6 vs 53.2
- Business email Category81.3 vs 68.3
- Marketing copy Category85.0 vs 79.1
Questions people ask
Is CleverHumanizer better than StealthGPT?
StealthGPT finished 5.1 points ahead of CleverHumanizer in the September 2026 cycle, 71.90 to 66.80, ranking #7 against #9 in a field of 11. StealthGPT scored higher on 1 of 7 detectors and 2 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, CleverHumanizer or StealthGPT?
CleverHumanizer posted the higher bypass rate, 86.5 vs 74.6, and scored higher on 6 of 7 detectors. CleverHumanizer led on GPTZero, Winston AI, Originality.ai, ZeroGPT, Grammarly and QuillBot; StealthGPT led on Copyleaks. The overall bypass gap is inside both 95% confidence intervals, so it is not a reliable difference.
Do CleverHumanizer and StealthGPT keep the original meaning?
StealthGPT preserved meaning better, 70.1 vs 65.3 on our 0–100 similarity scale. On readability, StealthGPT rated higher, 82.7 vs 73.2. Penalties this cycle: CleverHumanizer −11.0, StealthGPT −3.0.