Detecting LLM-Generated Texts with Classical Machine Learning

Detecting LLM-Generated Texts with "Classical" Machine Learning

Fed up with low-quality AI fanfics on Lofter, I built a detector using scikit-learn and TF-IDF instead of complex LLMs. By training on pre-ChatGPT human texts and diverse AI outputs from Gemini, Qwen, and Deepseek, my simple models achieved 85% accuracy. This proves that traditional machine learning can effectively spot statistical patterns in AI writing without expensive inference.

"Old-school ML still slaps—way better than those dumb online tools that just ask an LLM, Hey, is this text AI-generated?"