AI Humanizer BenchmarkLeaderboard / Compare / UndetectedGPT vs WriteHuman
Head to head · September 2026 cycle
UndetectedGPT vs WriteHuman
UndetectedGPT finished 3.3 points ahead of WriteHuman in the September 2026 cycle, 84.90 to 81.60, ranking #1 against #3 in a field of 11. UndetectedGPT scored higher on 3 of 7 detectors and 5 of 7 writing categories. WriteHuman came out ahead on Bypass rate (90.4 vs 86.3), Copyleaks (63.6 vs 21.2), Winston AI (82.1 vs 54.4). The bypass-rate gap, 90.4 to 86.3, sits inside both tools' 95% confidence intervals, so treat bypass as a draw.
- Detectors
- 3 – 4
- Categories
- 5 – 2
- Components
- 4 – 1
- 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. WriteHuman 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.
UndetectedGPT
12 wins- Meaning preservation Score84.8 vs 76.2
- Consistency Score91.5 vs 86.4
- Readability Score77.3 vs 72.4
- Penalties ScoreNone vs −1.0
- GPTZero Detector80.0 vs 56.5
- Originality.ai Detector79.2 vs 59.2
- QuillBot Detector92.7 vs 92.2
- Business email Category79.7 vs 69.5
- Discussion board Category90.3 vs 83.1
- News article Category85.9 vs 79.6
- Academic essay Category89.2 vs 86.2
- Application essay Category86.2 vs 84.9
WriteHuman
7 wins- Bypass rate Score90.4 vs 86.3
- Copyleaks Detector63.6 vs 21.2
- Winston AI Detector82.1 vs 54.4
- ZeroGPT Detector92.0 vs 85.1
- Grammarly Detector94.2 vs 89.3
- Blog post Category80.6 vs 77.6
- Marketing copy Category86.2 vs 85.8
Questions people ask
Is UndetectedGPT better than WriteHuman?
UndetectedGPT finished 3.3 points ahead of WriteHuman in the September 2026 cycle, 84.90 to 81.60, ranking #1 against #3 in a field of 11. UndetectedGPT scored higher on 3 of 7 detectors and 5 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, UndetectedGPT or WriteHuman?
WriteHuman posted the higher bypass rate, 90.4 vs 86.3, and scored higher on 4 of 7 detectors. UndetectedGPT led on GPTZero, Originality.ai and QuillBot; WriteHuman led on Winston AI, ZeroGPT, Grammarly and Copyleaks. The overall bypass gap is inside both 95% confidence intervals, so it is not a reliable difference.
Do UndetectedGPT and WriteHuman keep the original meaning?
UndetectedGPT preserved meaning better, 84.8 vs 76.2 on our 0–100 similarity scale. On readability, UndetectedGPT rated higher, 77.3 vs 72.4. Penalties this cycle: UndetectedGPT None, WriteHuman −1.0.