AI Humanizer BenchmarkLeaderboard / Compare / SmartHumanizer vs UndetectedGPT
Head to head · October 2026 cycle
SmartHumanizer vs UndetectedGPT
On the October 2026 leaderboard, UndetectedGPT leads SmartHumanizer 88.12 to 80.20, a gap of 7.92 points. UndetectedGPT ranks #1 and SmartHumanizer ranks #4 out of 11 tools. UndetectedGPT scores higher on all 7 detectors and in all 7 writing categories. SmartHumanizer is ahead on meaning preservation (82.9 vs 77.4).
- Detectors
- 0 – 7
- Categories
- 0 – 7
- Components
- 1 – 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
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. UndetectedGPT 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.
SmartHumanizer
1 win- Meaning preservation Score82.9 vs 77.4
UndetectedGPT
17 wins- Bypass rate Score96.0 vs 78.2
- Consistency Score96.6 vs 84.3
- Readability Score83.6 vs 77.5
- GPTZero Detector72.0 vs 28.3
- Winston AI Detector84.4 vs 60.0
- Grammarly Detector96.8 vs 81.6
- ZeroGPT Detector92.3 vs 77.1
- Originality.ai Detector96.7 vs 82.9
- QuillBot Detector91.0 vs 80.4
- Copyleaks Detector78.8 vs 72.7
- Blog post Category87.9 vs 72.2
- Application essay Category88.1 vs 75.6
- Business email Category84.3 vs 74.5
- News article Category92.4 vs 85.4
- Discussion board Category91.7 vs 88.6
- Academic essay Category90.5 vs 87.6
- Marketing copy Category84.0 vs 81.4
Questions people ask
Is SmartHumanizer better than UndetectedGPT?
On the October 2026 leaderboard, UndetectedGPT has an overall score of 88.12 and SmartHumanizer has 80.20, a gap of 7.92 points. UndetectedGPT ranks #1 and SmartHumanizer ranks #4 out of 11 tools. UndetectedGPT scores higher on all 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 UndetectedGPT?
UndetectedGPT has the higher bypass rate, 96.0% vs 78.2% for SmartHumanizer. It scores higher on all 7 detectors. The two tools' 95% confidence intervals for bypass rate do not overlap.
Do SmartHumanizer and UndetectedGPT 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 UndetectedGPT scores 77.4. On readability, UndetectedGPT scores higher, 83.6 vs 77.5. Neither tool had penalties this cycle.