AI Humanizer BenchmarkLeaderboard / Compare / CleverHumanizer vs StealthGPT
Head to head · October 2026 cycle
CleverHumanizer vs StealthGPT
On the October 2026 leaderboard, CleverHumanizer leads StealthGPT 68.06 to 64.52, a gap of 3.54 points. CleverHumanizer ranks #8 and StealthGPT ranks #9 out of 11 tools. CleverHumanizer scores higher on all 7 detectors and in 6 of 7 writing categories. StealthGPT is ahead on penalties (−4.0 vs −9.0), readability (80.6 vs 76.8) and meaning preservation (67.7 vs 65.5). On bypass rate, StealthGPT scores 62.8% and CleverHumanizer scores 85.9%, but their 95% confidence intervals overlap, so that difference is not statistically clear.
- Detectors
- 7 – 0
- Categories
- 6 – 1
- Components
- 2 – 3
- Last tested
- Prompts
- 33
- Methodology
- v1.1.0
Score components
The overall score weights bypass rate at 42%, meaning preservation at 32%, readability at 16% and consistency across writing categories at 10%. Penalties for output-quality failures are then subtracted. Full scoring formula
Overlapping CIs means the two tools' 95% confidence intervals for bypass rate overlap, so the bypass difference is not statistically clear.
Detector by detector
Each figure is one detector's average human-likelihood score across all of a tool's outputs, on a 0–100 scale. Higher means more human. CleverHumanizer scores higher on all 7 detectors.
Writing categories
Each category score applies the overall-score weights to that category's prompts only. Bypass, meaning preservation and readability are averaged within the category, and the tool's overall consistency score is added. Penalties are not subtracted. Categories with few prompts give less reliable scores, so each row shows its prompt count.
Where each one wins
Measures where one tool is ahead of the other. Ties are left out. Score components come first, then detectors, then categories, with the largest gap first in each group.
CleverHumanizer
15 wins- Bypass rate Score85.9 vs 62.8
- Consistency Score77.3 vs 75.9
- GPTZero Detector78.3 vs 41.5
- Originality.ai Detector93.8 vs 62.7
- Winston AI Detector85.2 vs 55.3
- Grammarly Detector88.2 vs 69.0
- QuillBot Detector76.9 vs 61.3
- ZeroGPT Detector78.1 vs 67.4
- Copyleaks Detector69.7 vs 60.6
- Application essay Category70.2 vs 51.2
- Blog post Category85.1 vs 70.1
- News article Category81.8 vs 70.8
- Discussion board Category79.3 vs 69.6
- Business email Category62.3 vs 59.5
- Academic essay Category79.7 vs 78.3
StealthGPT
4 wins- Penalties Score−4.0 vs −9.0
- Readability Score80.6 vs 76.8
- Meaning preservation Score67.7 vs 65.5
- Marketing copy Category77.3 vs 77.1
Questions people ask
Is CleverHumanizer better than StealthGPT?
On the October 2026 leaderboard, CleverHumanizer has an overall score of 68.06 and StealthGPT has 64.52, a gap of 3.54 points. CleverHumanizer ranks #8 and StealthGPT ranks #9 out of 11 tools. CleverHumanizer scores higher on all 7 detectors and in 6 of 7 writing categories. Both tools rewrote the same 33 prompts, the same 7 detectors checked every output, and scoring followed methodology v1.1.0. All inputs, outputs and detector verdicts are public.
Which bypasses AI detectors better, CleverHumanizer or StealthGPT?
CleverHumanizer has the higher bypass rate, 85.9% vs 62.8% for StealthGPT. It scores higher on all 7 detectors. The two tools' 95% confidence intervals for bypass rate overlap, so the difference is not statistically clear.
Do CleverHumanizer and StealthGPT keep the original meaning?
Meaning preservation measures how close each output stays to its input, using embedding similarity on a 0–100 scale. StealthGPT scores 67.7 and CleverHumanizer scores 65.5. On readability, StealthGPT scores higher, 80.6 vs 76.8. This cycle, CleverHumanizer lost 9.0 points to penalties and StealthGPT lost 4.0 points to penalties.