Why Standard ChatGPT Text Gets Flagged by AI Detectors

Ever wondered why detectors like GPTZero or Originality can spot AI content so accurately? It comes down to two mathematical metrics: perplexity and burstiness.

What is Perplexity?

Perplexity measures the randomness of word choices. AI models choose the most statistically logical next word, meaning their perplexity is low. Human writers use less predictable vocabulary, generating high perplexity.

What is Burstiness?

Burstiness measures sentence variation. AI models write sentences of uniform length and complexity. Human writing has high burstiness—some sentences are simple fragments, others are long, descriptive, and winding.

How to beat the algorithms

By using a dedicated tool like Humanizer.gg, you transform text to maximize both perplexity and burstiness automatically, rendering it indistinguishable from human writing.