AI Humanizer BenchmarkLeaderboard / Compare / HIX Bypass vs UndetectedGPT
Head to head · September 2026 cycle
HIX Bypass vs UndetectedGPT
UndetectedGPT finished 11.1 points ahead of HIX Bypass in the September 2026 cycle, 84.90 to 73.80, ranking #1 against #6 in a field of 11. UndetectedGPT scored higher on 4 of 7 detectors and 7 of 7 writing categories. HIX Bypass came out ahead on Copyleaks (54.5 vs 21.2), Winston AI (69.1 vs 54.4), ZeroGPT (86.0 vs 85.1). The bypass-rate gap, 73.2 to 86.3, sits inside both tools' 95% confidence intervals, so treat bypass as a draw.
- Detectors
- 3 – 4
- Categories
- 0 – 7
- Components
- 0 – 4
- 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. UndetectedGPT 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.
HIX Bypass
3 wins- Copyleaks Detector54.5 vs 21.2
- Winston AI Detector69.1 vs 54.4
- ZeroGPT Detector86.0 vs 85.1
UndetectedGPT
15 wins- Consistency Score91.5 vs 69.9
- Readability Score77.3 vs 63.8
- Bypass rate Score86.3 vs 73.2
- Meaning preservation Score84.8 vs 80.8
- GPTZero Detector80.0 vs 15.7
- Originality.ai Detector79.2 vs 24.6
- QuillBot Detector92.7 vs 88.9
- Grammarly Detector89.3 vs 88.0
- Business email Category79.7 vs 40.2
- Discussion board Category90.3 vs 69.5
- Application essay Category86.2 vs 71.0
- Academic essay Category89.2 vs 83.4
- Marketing copy Category85.8 vs 80.4
- Blog post Category77.6 vs 73.3
- News article Category85.9 vs 85.7
Questions people ask
Is HIX Bypass better than UndetectedGPT?
UndetectedGPT finished 11.1 points ahead of HIX Bypass in the September 2026 cycle, 84.90 to 73.80, ranking #1 against #6 in a field of 11. UndetectedGPT scored higher on 4 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, HIX Bypass or UndetectedGPT?
UndetectedGPT posted the higher bypass rate, 86.3 vs 73.2, and scored higher on 4 of 7 detectors. HIX Bypass led on Winston AI, ZeroGPT and Copyleaks; UndetectedGPT led on GPTZero, Originality.ai, Grammarly and QuillBot. The overall bypass gap is inside both 95% confidence intervals, so it is not a reliable difference.
Do HIX Bypass and UndetectedGPT keep the original meaning?
UndetectedGPT preserved meaning better, 84.8 vs 80.8 on our 0–100 similarity scale. On readability, UndetectedGPT rated higher, 77.3 vs 63.8. Penalties this cycle: HIX Bypass None, UndetectedGPT None.