This article is currently an experimental machine translation and may contain errors. If anything is unclear, please refer to the original Chinese version. I am continuously working to improve the translation.

TL;DR & Demo

As of early 2026, mainstream LLM-generated text exhibits strong statistical patterns that can be effectively distinguished from human-written content using traditional machine learning models. I suspect this is how many so-called “AI plagiarism checkers” actually work under the hood.

Online Demo: https://lyc8503.github.io/AITextDetector/

The model used in this demo is not trained on general-purpose data , nor has it undergone rigorous optimization or iteration. Its single-sentence detection accuracy is approximately 85% on the test set.…