AI Humanizer BenchmarkLeaderboard / Compare / CleverHumanizer vs UndetectedGPT
Head to head · September 2026 cycle
CleverHumanizer vs UndetectedGPT
UndetectedGPT finished 18.1 points ahead of CleverHumanizer in the September 2026 cycle, 84.90 to 66.80, ranking #1 against #9 in a field of 11. UndetectedGPT scored higher on 3 of 7 detectors and 6 of 7 writing categories. CleverHumanizer came out ahead on Bypass rate (86.5 vs 86.3), Copyleaks (53.2 vs 21.2), Winston AI (70.5 vs 54.4). The bypass-rate gap, 86.5 to 86.3, sits inside both tools' 95% confidence intervals, so treat bypass as a draw.
- Detectors
- 4 – 3
- Categories
- 1 – 6
- Components
- 1 – 4
- 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 4 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
6 wins- Bypass rate Score86.5 vs 86.3
- Copyleaks Detector53.2 vs 21.2
- Winston AI Detector70.5 vs 54.4
- GPTZero Detector90.0 vs 80.0
- Grammarly Detector96.9 vs 89.3
- Blog post Category81.5 vs 77.6
UndetectedGPT
13 wins- Meaning preservation Score84.8 vs 65.3
- Penalties ScoreNone vs −11.0
- Readability Score77.3 vs 73.2
- Consistency Score91.5 vs 88.8
- Originality.ai Detector79.2 vs 67.0
- ZeroGPT Detector85.1 vs 77.9
- QuillBot Detector92.7 vs 88.8
- Application essay Category86.2 vs 71.7
- Discussion board Category90.3 vs 77.6
- Business email Category79.7 vs 68.3
- Academic essay Category89.2 vs 81.4
- Marketing copy Category85.8 vs 79.1
- News article Category85.9 vs 82.9
Questions people ask
Is CleverHumanizer better than UndetectedGPT?
UndetectedGPT finished 18.1 points ahead of CleverHumanizer in the September 2026 cycle, 84.90 to 66.80, ranking #1 against #9 in a field of 11. UndetectedGPT scored higher on 3 of 7 detectors and 6 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 UndetectedGPT?
CleverHumanizer posted the higher bypass rate, 86.5 vs 86.3, and scored higher on 4 of 7 detectors. CleverHumanizer led on GPTZero, Winston AI, Grammarly and Copyleaks; UndetectedGPT led on Originality.ai, ZeroGPT and QuillBot. The overall bypass gap is inside both 95% confidence intervals, so it is not a reliable difference.
Do CleverHumanizer and UndetectedGPT keep the original meaning?
UndetectedGPT preserved meaning better, 84.8 vs 65.3 on our 0–100 similarity scale. On readability, UndetectedGPT rated higher, 77.3 vs 73.2. Penalties this cycle: CleverHumanizer −11.0, UndetectedGPT None.