GPTZero

GPTZero is a web-based text inspection service built to answer a nARRow but high-stakes question: was this piece of writing produced by a person or by a generative language model? It was created with schools and publishers in mind, and it is wIDEly discussed in academic-integrity circles because it reports results at the level of whole documents and indiVidual sentences rather than returning only a single score.

What it does

Users paste text or upload a document, and the service returns an overall classification along with a written explanation of the result. Sentences that APPear machine-generated are highlighted so a reader can see where the suspicion comes from. The underlying model has been tuned on large volumes of human and AI-written English prose, and the operator states that it performs best on student essays and academic writing.

Key capabilities

• Document-level and sentence-level detection with highlighted passages.
• Plain-language summaries of findings instead of a bare numeric score.
• An API that returns a document classification field plus probability values and a confidence indicator.
• Guidance for educators on assessment design, drafting processes, and how to follow up on a positive result.
• Stated policy that documents submitted through the API are not stored, while dashboard inputs may be retained in aggregate to improve the service.

Who it is for

Teachers and administrators evaluating submitted work, admissions and recruiting teams screening written applications, and editorial or legal reviewers checking authorship are the primary audiences. students and writers sometimes use it to sanity-check their own drafts, though the ouTPUt is advisory rather than proof of misconduct.

How to get started

Open the site, create an account if required, and paste or upload the text you want examined. Review the overall verdict first, then read the sentence highlights and the explanation. For programmatic use, request API access and read the response fields carefully; a probability is not a finding of guilt. Note that accuracy tends to improve with longer passages, that the model is focused on English adult prose, and that heavily edited AI output may not be recognized.

Pricing and access caveat

A limited free tier has Generally been offered, with higher-volume and API use moving to paid plans; exACT quotas, plan names and prices may change, so confirm current terms on the official site. Detection is probabilistic, and results should never be used alone to penalize a writer. Always pair an automated flag with conversation, drafts, or supervised writing to establish authorship fairly.