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. Please read through this article before use to understand potential limitations.…