AI Humanizer BenchmarkLeaderboard / Compare / GPTinf vs UndetectedGPT
Head to head · October 2026 cycle
GPTinf vs UndetectedGPT
On the October 2026 leaderboard, UndetectedGPT leads GPTinf 88.12 to 80.74, a gap of 7.38 points. UndetectedGPT ranks #1 and GPTinf ranks #3 out of 11 tools. UndetectedGPT scores higher on 6 of 7 detectors and in all 7 writing categories. GPTinf is ahead on Winston AI (89.1 vs 84.4). On bypass rate, GPTinf scores 88.7% and UndetectedGPT scores 96.0%, but their 95% confidence intervals overlap, so that difference is not statistically clear.
- Detectors
- 1 – 6
- Categories
- 0 – 7
- Components
- 0 – 4
- Last tested
- Prompts
- 33
- Methodology
- v1.1.0
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
Overlapping CIs means the two tools' 95% confidence intervals for bypass rate overlap, so the bypass difference is not statistically clear.
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. UndetectedGPT scores higher on 6 of 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.
GPTinf
1 win- Winston AI Detector89.1 vs 84.4
UndetectedGPT
17 wins- Meaning preservation Score77.4 vs 68.3
- Bypass rate Score96.0 vs 88.7
- Readability Score83.6 vs 77.7
- Consistency Score96.6 vs 92.1
- Copyleaks Detector78.8 vs 57.6
- GPTZero Detector72.0 vs 55.1
- Grammarly Detector96.8 vs 88.4
- ZeroGPT Detector92.3 vs 84.5
- QuillBot Detector91.0 vs 86.4
- Originality.ai Detector96.7 vs 92.2
- Blog post Category87.9 vs 77.6
- Academic essay Category90.5 vs 81.9
- Application essay Category88.1 vs 79.7
- News article Category92.4 vs 84.1
- Discussion board Category91.7 vs 84.0
- Business email Category84.3 vs 79.2
- Marketing copy Category84.0 vs 81.1
Questions people ask
Is GPTinf better than UndetectedGPT?
On the October 2026 leaderboard, UndetectedGPT has an overall score of 88.12 and GPTinf has 80.74, a gap of 7.38 points. UndetectedGPT ranks #1 and GPTinf ranks #3 out of 11 tools. UndetectedGPT scores higher on 6 of 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 v1.1.0. All inputs, outputs and detector verdicts are public.
Which bypasses AI detectors better, GPTinf or UndetectedGPT?
UndetectedGPT has the higher bypass rate, 96.0% vs 88.7% for GPTinf. UndetectedGPT scores higher on GPTZero, Originality.ai, ZeroGPT, Grammarly, QuillBot and Copyleaks. GPTinf scores higher on Winston AI. The two tools' 95% confidence intervals for bypass rate overlap, so the difference is not statistically clear.
Do GPTinf and UndetectedGPT keep the original meaning?
Meaning preservation measures how close each output stays to its input, using embedding similarity on a 0–100 scale. UndetectedGPT scores 77.4 and GPTinf scores 68.3. On readability, UndetectedGPT scores higher, 83.6 vs 77.7. Neither tool had penalties this cycle.