AI Humanizer BenchmarkLeaderboard / Compare / StealthGPT vs Undetectable AI
Head to head · September 2026 cycle
StealthGPT vs Undetectable AI
StealthGPT finished 33.7 points ahead of Undetectable AI in the September 2026 cycle, 71.90 to 38.20, ranking #7 against #11 in a field of 11. StealthGPT scored higher on 7 of 7 detectors and 7 of 7 writing categories. Undetectable AI came out ahead on Consistency (99.6 vs 78.5), Meaning preservation (89.6 vs 70.1).
- Detectors
- 7 – 0
- Categories
- 7 – 0
- Components
- 3 – 2
- 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
Detector by detector
Share of each tool's outputs that a detector classified as human-written. StealthGPT took 7 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.
StealthGPT
17 wins- Bypass rate Score74.6 vs 0.2
- Readability Score82.7 vs 71.7
- Penalties Score−3.0 vs −12.0
- GPTZero Detector78.2 vs 6.1
- Winston AI Detector62.1 vs 0.1
- Grammarly Detector77.5 vs 18.5
- Copyleaks Detector57.6 vs 0.0
- QuillBot Detector66.0 vs 16.6
- Originality.ai Detector48.2 vs 0.0
- ZeroGPT Detector66.5 vs 26.5
- Marketing copy Category85.0 vs 50.9
- Academic essay Category80.0 vs 48.0
- Business email Category81.3 vs 50.9
- Blog post Category76.6 vs 52.9
- Application essay Category66.5 vs 47.8
- News article Category68.8 vs 51.6
- Discussion board Category57.2 vs 50.8
Undetectable AI
2 wins- Consistency Score99.6 vs 78.5
- Meaning preservation Score89.6 vs 70.1
Questions people ask
Is StealthGPT better than Undetectable AI?
StealthGPT finished 33.7 points ahead of Undetectable AI in the September 2026 cycle, 71.90 to 38.20, ranking #7 against #11 in a field of 11. StealthGPT scored higher on 7 of 7 detectors and 7 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, StealthGPT or Undetectable AI?
StealthGPT posted the higher bypass rate, 74.6 vs 0.2, and scored higher on 7 of 7 detectors. StealthGPT led on GPTZero, Winston AI, Originality.ai, ZeroGPT, Grammarly, QuillBot and Copyleaks; Undetectable AI led on none. The gap holds outside both tools' 95% confidence intervals.
Do StealthGPT and Undetectable AI keep the original meaning?
Undetectable AI preserved meaning better, 89.6 vs 70.1 on our 0–100 similarity scale. On readability, StealthGPT rated higher, 82.7 vs 71.7. Penalties this cycle: StealthGPT −3.0, Undetectable AI −12.0.