AI Humanizer BenchmarkLeaderboard / Compare / Rephrasy vs StealthGPT
Head to head · November 2026 cycle
Rephrasy vs StealthGPT
On the November 2026 leaderboard, Rephrasy leads StealthGPT 72.97 to 52.87, a gap of 20.10 points. Rephrasy ranks #3 and StealthGPT ranks #8 out of 10 tools. Rephrasy scores higher on all 7 detectors and in all 7 writing categories. StealthGPT is ahead on readability (81.5 vs 75.3).
- Detectors
- 7 – 0
- Categories
- 7 – 0
- Components
- 4 – 1
- Last tested
- Prompts
- 33
- Methodology
- v1.2.0
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
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. Rephrasy scores higher on all 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.
Rephrasy
18 wins- Bypass rate Score80.0 vs 38.2
- Meaning preservation Score69.6 vs 65.1
- Penalties Score−3.0 vs −5.0
- Consistency Score80.7 vs 79.4
- Copyleaks Detector87.9 vs 39.4
- GPTZero Detector82.6 vs 38.7
- QuillBot Detector83.9 vs 56.0
- ZeroGPT Detector75.5 vs 52.7
- Grammarly Detector86.5 vs 65.1
- Originality.ai Detector28.1 vs 9.1
- Pangram Detector17.2 vs 16.9
- Discussion board Category84.7 vs 50.3
- Blog post Category79.0 vs 56.1
- Marketing copy Category82.3 vs 60.2
- Business email Category70.2 vs 54.3
- Application essay Category61.4 vs 46.8
- News article Category78.7 vs 67.9
- Academic essay Category78.4 vs 69.0
StealthGPT
1 win- Readability Score81.5 vs 75.3
Questions people ask
Is Rephrasy better than StealthGPT?
On the November 2026 leaderboard, Rephrasy has an overall score of 72.97 and StealthGPT has 52.87, a gap of 20.10 points. Rephrasy ranks #3 and StealthGPT ranks #8 out of 10 tools. Rephrasy scores higher on all 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 v1.2.0. All inputs, outputs and detector verdicts are public.
Which bypasses AI detectors better, Rephrasy or StealthGPT?
Rephrasy has the higher bypass rate, 80.0% vs 38.2% for StealthGPT. It scores higher on all 7 detectors. The two tools' 95% confidence intervals for bypass rate do not overlap.
Do Rephrasy and StealthGPT keep the original meaning?
Meaning preservation measures how close each output stays to its input, using embedding similarity on a 0–100 scale. Rephrasy scores 69.6 and StealthGPT scores 65.1. On readability, StealthGPT scores higher, 81.5 vs 75.3. This cycle, Rephrasy lost 3.0 points to penalties and StealthGPT lost 5.0 points to penalties.