AI Humanizer BenchmarkLeaderboard / Compare / GPTinf vs StealthGPT
Head to head · September 2026 cycle
GPTinf vs StealthGPT
GPTinf finished 6.4 points ahead of StealthGPT in the September 2026 cycle, 78.30 to 71.90, ranking #4 against #7 in a field of 11. GPTinf scored higher on 4 of 7 detectors and 4 of 7 writing categories. StealthGPT came out ahead on Readability (82.7 vs 76.7), Originality.ai (48.2 vs 33.8), GPTZero (78.2 vs 69.8). The bypass-rate gap, 74.6 to 79.9, sits inside both tools' 95% confidence intervals, so treat bypass as a draw.
- Detectors
- 4 – 2
- Categories
- 4 – 3
- 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. GPTinf 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.
GPTinf
12 wins- Meaning preservation Score75.7 vs 70.1
- Bypass rate Score79.9 vs 74.6
- Consistency Score82.2 vs 78.5
- Penalties ScoreNone vs −3.0
- QuillBot Detector84.9 vs 66.0
- ZeroGPT Detector85.2 vs 66.5
- Grammarly Detector87.6 vs 77.5
- Winston AI Detector63.0 vs 62.1
- Discussion board Category82.9 vs 57.2
- Application essay Category79.5 vs 66.5
- Academic essay Category85.3 vs 80.0
- News article Category73.2 vs 68.8
StealthGPT
6 wins- Readability Score82.7 vs 76.7
- Originality.ai Detector48.2 vs 33.8
- GPTZero Detector78.2 vs 69.8
- Business email Category81.3 vs 61.8
- Marketing copy Category85.0 vs 81.7
- Blog post Category76.6 vs 75.0
Questions people ask
Is GPTinf better than StealthGPT?
GPTinf finished 6.4 points ahead of StealthGPT in the September 2026 cycle, 78.30 to 71.90, ranking #4 against #7 in a field of 11. GPTinf scored higher on 4 of 7 detectors and 4 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, GPTinf or StealthGPT?
GPTinf posted the higher bypass rate, 79.9 vs 74.6, and scored higher on 4 of 7 detectors. GPTinf led on Winston AI, ZeroGPT, Grammarly and QuillBot; StealthGPT led on GPTZero and Originality.ai. The overall bypass gap is inside both 95% confidence intervals, so it is not a reliable difference.
Do GPTinf and StealthGPT keep the original meaning?
GPTinf preserved meaning better, 75.7 vs 70.1 on our 0–100 similarity scale. On readability, StealthGPT rated higher, 82.7 vs 76.7. Penalties this cycle: GPTinf None, StealthGPT −3.0.