AI Humanizer BenchmarkLeaderboard / Compare / CleverHumanizer vs UndetectedGPT
Head to head · October 2026 cycle
CleverHumanizer vs UndetectedGPT
On the October 2026 leaderboard, UndetectedGPT leads CleverHumanizer 88.12 to 68.06, a gap of 20.06 points. UndetectedGPT ranks #1 and CleverHumanizer ranks #8 out of 11 tools. UndetectedGPT scores higher on 5 of 7 detectors and in all 7 writing categories. CleverHumanizer is ahead on GPTZero (78.3 vs 72.0) and Winston AI (85.2 vs 84.4). On bypass rate, CleverHumanizer scores 85.9% and UndetectedGPT scores 96.0%, but their 95% confidence intervals overlap, so that difference is not statistically clear.
- Detectors
- 2 – 5
- Categories
- 0 – 7
- Components
- 0 – 5
- 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. UndetectedGPT scores higher on 5 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.
CleverHumanizer
2 wins- GPTZero Detector78.3 vs 72.0
- Winston AI Detector85.2 vs 84.4
UndetectedGPT
17 wins- Consistency Score96.6 vs 77.3
- Meaning preservation Score77.4 vs 65.5
- Bypass rate Score96.0 vs 85.9
- Penalties ScoreNone vs −9.0
- Readability Score83.6 vs 76.8
- ZeroGPT Detector92.3 vs 78.1
- QuillBot Detector91.0 vs 76.9
- Copyleaks Detector78.8 vs 69.7
- Grammarly Detector96.8 vs 88.2
- Originality.ai Detector96.7 vs 93.8
- Business email Category84.3 vs 62.3
- Application essay Category88.1 vs 70.2
- Discussion board Category91.7 vs 79.3
- Academic essay Category90.5 vs 79.7
- News article Category92.4 vs 81.8
- Marketing copy Category84.0 vs 77.1
- Blog post Category87.9 vs 85.1
Questions people ask
Is CleverHumanizer better than UndetectedGPT?
On the October 2026 leaderboard, UndetectedGPT has an overall score of 88.12 and CleverHumanizer has 68.06, a gap of 20.06 points. UndetectedGPT ranks #1 and CleverHumanizer ranks #8 out of 11 tools. UndetectedGPT scores higher on 5 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, CleverHumanizer or UndetectedGPT?
UndetectedGPT has the higher bypass rate, 96.0% vs 85.9% for CleverHumanizer. UndetectedGPT scores higher on Originality.ai, ZeroGPT, Grammarly, QuillBot and Copyleaks. CleverHumanizer scores higher on GPTZero and Winston AI. The two tools' 95% confidence intervals for bypass rate overlap, so the difference is not statistically clear.
Do CleverHumanizer 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. UndetectedGPT scores 77.4 and CleverHumanizer scores 65.5. On readability, UndetectedGPT scores higher, 83.6 vs 76.8. This cycle, CleverHumanizer lost 9.0 points to penalties and UndetectedGPT had no penalties.