LLM Fingerprinting
Perplexity-Based Detection of Single-Model LLM Output
A reference model's perplexity score reveals whether a document was machine-generated.
Marcus Elesin · October 4, 2026 · 11 min read
Contributing Researcher, Benchmarks
3 stories
A reference model's perplexity score reveals whether a document was machine-generated.
Every language model leaves a detectable statistical signature in its token choices.
Repeated use of the same LLM compounds detection risk across your entire body of work.