Verdict
GPTZero is the only detector in this series to score perfectly on both AI detection and false positives. Every AI-generated sample returned 100% AI, and every human-written sample returned 0% AI.
Whether that flawless false positive record comes from a genuinely better model or from a lower detection threshold is something I can’t answer for sure, but either way, the practical result is that GPTZero did not wrongly accuse a single human-written piece in my test set, and I consider that to be a huge win. What’s more, the free tier is generous enough for personal use, and the pricing is reasonable if you need more.
Have you used GPTZero? Share your results and experience in the comments below.