Tool detects which AI model wrote text using gzip compression distance
dejanseo · x · 2026-08-25
The author shares a tool called "Which AI wrote this?" that uses Normalized Compression Distance (NCD) and k-nearest-neighbors to identify which AI model generated a piece of text by comparing gzip compression patterns.
- Method: If two texts compress well together, they likely share the same author's patterns. It requires no model weights or embeddings, relying purely on compression algorithms.
- Corpus: Includes samples from models like Ox-Alpha, Gemini, GPT, Claude, and GLM.
Related event: Gzip-Based Tool Guesses Which AI Wrote a Text(2 posts)→
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