Does GPTZero detect Claude?
Yes
Yes. GPTZero scores perplexity and burstiness, which are model-agnostic properties of the writing.
How it works
Perplexity measures how surprising each word is; burstiness measures how much sentence length and complexity vary. Assistant prose scores low on both. Claude is no exception.
The part people miss
Non-native English writers and people who write in a deliberately plain, uniform style score low on the same two measures.
Flagged for something you wrote yourself?
There is a right order to handle it in, and editing the document first destroys your best evidence.