AI Humanizer BenchmarkLeaderboard / Compare / SmartHumanizer vs StealthGPT
Head to head · October 2026 cycle
SmartHumanizer vs StealthGPT
On the October 2026 leaderboard, SmartHumanizer leads StealthGPT 80.20 to 64.52, a gap of 15.68 points. SmartHumanizer ranks #4 and StealthGPT ranks #9 out of 11 tools. SmartHumanizer scores higher on 6 of 7 detectors and in all 7 writing categories. StealthGPT is ahead on readability (80.6 vs 77.5) and GPTZero (41.5 vs 28.3). On bypass rate, StealthGPT scores 62.8% and SmartHumanizer scores 78.2%, but their 95% confidence intervals overlap, so that difference is not statistically clear.
- Detectors
- 6 – 1
- Categories
- 7 – 0
- Components
- 4 – 1
- 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. SmartHumanizer scores higher on 6 of 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.
SmartHumanizer
17 wins- Bypass rate Score78.2 vs 62.8
- Meaning preservation Score82.9 vs 67.7
- Consistency Score84.3 vs 75.9
- Penalties ScoreNone vs −4.0
- Originality.ai Detector82.9 vs 62.7
- QuillBot Detector80.4 vs 61.3
- Grammarly Detector81.6 vs 69.0
- Copyleaks Detector72.7 vs 60.6
- ZeroGPT Detector77.1 vs 67.4
- Winston AI Detector60.0 vs 55.3
- Application essay Category75.6 vs 51.2
- Discussion board Category88.6 vs 69.6
- Business email Category74.5 vs 59.5
- News article Category85.4 vs 70.8
- Academic essay Category87.6 vs 78.3
- Marketing copy Category81.4 vs 77.3
- Blog post Category72.2 vs 70.1
StealthGPT
2 wins- Readability Score80.6 vs 77.5
- GPTZero Detector41.5 vs 28.3
Questions people ask
Is SmartHumanizer better than StealthGPT?
On the October 2026 leaderboard, SmartHumanizer has an overall score of 80.20 and StealthGPT has 64.52, a gap of 15.68 points. SmartHumanizer ranks #4 and StealthGPT ranks #9 out of 11 tools. SmartHumanizer scores higher on 6 of 7 detectors and in all 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, SmartHumanizer or StealthGPT?
SmartHumanizer has the higher bypass rate, 78.2% vs 62.8% for StealthGPT. SmartHumanizer scores higher on Winston AI, Originality.ai, ZeroGPT, Grammarly, QuillBot and Copyleaks. StealthGPT scores higher on GPTZero. The two tools' 95% confidence intervals for bypass rate overlap, so the difference is not statistically clear.
Do SmartHumanizer 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. SmartHumanizer scores 82.9 and StealthGPT scores 67.7. On readability, StealthGPT scores higher, 80.6 vs 77.5. This cycle, SmartHumanizer had no penalties and StealthGPT lost 4.0 points to penalties.