October 2026 review
Best AI Detector for Teachers: 6 Tested (October 2026)
Detectors by failed strict bypass rate, October 2026
| # | Detector | Count | Likely Original | Mixed | Likely AI | Version tested | |
|---|---|---|---|---|---|---|---|
| 1 | Originality.ai 5.0 | 96% | 528 of 550 | 15 of 550 | 63 of 550 | 472 of 550 | 5.0 |
| 2 | Pangram | 82% | 452 of 550 | — | — | — | 4.1 |
| 3 | GPTZero | 53% | 293 of 550 | — | — | — | 2026-10-07-base |
| 4 | Originality.ai Turbo | 23% | 128 of 550 | — | — | — | turbo |
| 5 | ZeroGPT | 17% | 94 of 550 | — | — | — | default |
| 6 | Winston AI | 11% | 62 of 550 | — | — | — | 5.0 |
Failed strict bypass rate is the share of humanized outputs that did not clear the 50% human-score threshold. That is evaluated minus strict bypass. A strict bypass is a human score above 50%, regardless of the vendor label. Vendor Mixed labels are a separate band and can still clear the threshold. Synthetic texts written by AI models for this benchmark, with no humanizer applied. On those 50 source texts, failed strict bypass rates ranged from 98% to 100%. That baseline is excluded from the pooled numbers.
Originality.ai 5.0
96%
96% failed strict bypass (528 of 550; human score ≤ 50%).
Pangram
82%
82% failed strict bypass (452 of 550; human score ≤ 50%).
GPTZero
53%
53% failed strict bypass (293 of 550; human score ≤ 50%).
How we tested
- Review
- October 2026
- Run date
- Sample
- 50 texts each (550 total)
- Strict bypass
- Human score above 50%
- Methodology
- v1.0
Related
Methodology
How texts are chosen and how every number is recomputed.
Originality.ai 5.0
Originality.ai 5.0 had the highest failed strict bypass rate in October 2026, at 96% of 550.
StealthGPT
Leader on the October 2026 humanizer leaderboard, at 80.3% mean bypass.
FAQ
What is failed strict bypass rate?
Failed strict bypass rate is the share of humanized outputs that did not clear the 50% human-score threshold.
Which detectors had the highest failed strict bypass rate on humanized text in October 2026?
Failed strict bypass rate is the share of humanized outputs that did not clear the 50% human-score threshold. Originality.ai 5.0 had the highest failed strict bypass rate, at 96% of 550 outputs. See the Originality.ai 5.0 page.
Does a failed strict bypass mean the vendor labeled the text as AI-written?
Failed strict bypass rate is the share of humanized outputs that did not clear the 50% human-score threshold. That is evaluated minus strict bypass. A strict bypass is a human score above 50%, regardless of the vendor label. Vendor Mixed labels are a separate band and can still clear the threshold.
Can teachers treat a detector result as proof?
These figures are not accuracy scores and not a student-work safety ranking. There is no human-written control set, so this is not a false-positive rate. Turnitin is untested. Teachers should not treat any detector result as proof. See the threshold used on this page.
Why are Turnitin and Copyleaks missing?
Turnitin and Copyleaks are not tested. Turnitin has no public API at this volume.