AI Humanizer BenchmarkLeaderboard / Compare / UndetectedGPT vs WriteHuman
Head to head · October 2026 cycle
UndetectedGPT vs WriteHuman
On the October 2026 leaderboard, UndetectedGPT leads WriteHuman 88.12 to 75.06, a gap of 13.06 points. UndetectedGPT ranks #1 and WriteHuman ranks #7 out of 11 tools. UndetectedGPT scores higher on 1 of 7 detectors and in all 7 writing categories. WriteHuman is ahead on bypass rate (97.6% vs 96.0%), GPTZero (100.0 vs 72.0) and Copyleaks (93.9 vs 78.8). The two tools' 95% confidence intervals for bypass rate overlap, so that difference is not statistically clear.
- Detectors
- 1 – 6
- 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. WriteHuman 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.
UndetectedGPT
12 wins- Meaning preservation Score77.4 vs 53.2
- Readability Score83.6 vs 71.4
- Penalties ScoreNone vs −4.0
- Consistency Score96.6 vs 96.0
- Grammarly Detector96.8 vs 95.9
- Blog post Category87.9 vs 77.2
- Discussion board Category91.7 vs 81.3
- Business email Category84.3 vs 73.9
- News article Category92.4 vs 82.8
- Academic essay Category90.5 vs 81.1
- Application essay Category88.1 vs 79.8
- Marketing copy Category84.0 vs 77.7
WriteHuman
7 wins- Bypass rate Score97.6 vs 96.0
- GPTZero Detector100.0 vs 72.0
- Copyleaks Detector93.9 vs 78.8
- Winston AI Detector94.8 vs 84.4
- Originality.ai Detector99.8 vs 96.7
- QuillBot Detector92.5 vs 91.0
- ZeroGPT Detector92.7 vs 92.3
Questions people ask
Is UndetectedGPT better than WriteHuman?
On the October 2026 leaderboard, UndetectedGPT has an overall score of 88.12 and WriteHuman has 75.06, a gap of 13.06 points. UndetectedGPT ranks #1 and WriteHuman ranks #7 out of 11 tools. UndetectedGPT scores higher on 1 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, UndetectedGPT or WriteHuman?
WriteHuman has the higher bypass rate, 97.6% vs 96.0% for UndetectedGPT. WriteHuman scores higher on GPTZero, Winston AI, Originality.ai, ZeroGPT, QuillBot and Copyleaks. UndetectedGPT scores higher on Grammarly. The two tools' 95% confidence intervals for bypass rate overlap, so the difference is not statistically clear.
Do UndetectedGPT and WriteHuman 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 WriteHuman scores 53.2. On readability, UndetectedGPT scores higher, 83.6 vs 71.4. This cycle, UndetectedGPT had no penalties and WriteHuman lost 4.0 points to penalties.