GPTzero

GPTzero helps you assess whether a piece of text may have been generated by a large language model (LLM) such as ChatGPT, Claude, Gemini, GPT-5/6, Llama, and others. It produces an overall AI detection result and pinpoints specific phrases most likely to be AI-generated, with analysis available at sentence, paragraph, and document levels.

Beyond detection, GPTzero includes tools to support writing verification and quality review. Writing Replay provides video proof of the writing process so you can better verify authentic voice and understand how a document was produced. You can also use writing feedback features and an AI Tutor for custom writing feedback.

For education and other organizations that review writing at scale, GPTzero is designed to fit into everyday workflows. It offers a Chrome extension for automatic AI detection and typing-pattern insights, along with integrations and deployment options such as Google Docs, Google Classroom, Canvas, Zapier, and an API.

Plans are available as a Free plan and paid annual tiers. Free includes 10,000 words per month with Basic AI Scan, plus 1 Free Advanced Scan and 5 Free AI Highlights in the Chrome Extension. Premium is $12.99/month billed annually for up to 300,000 words per month. Professional is $24.99/month billed annually for up to 500,000 words per month.

What does GPTzero detect?

GPTzero identifies likely AI-generated content and estimates the probability that text was produced by an LLM. It also highlights the specific phrases most likely to be AI-generated.

Can I scan text or upload files?

Yes. You can paste text or upload documents, including uploads from Google Drive, and then run a scan.

Does GPTzero work on mixed writing (human + AI)?

Yes. GPTzero can detect and classify mixed documents where human writing and AI-generated writing are combined.

Which kinds of AI-generated text can GPTzero classify?

GPTzero is built to classify AI text across major model families, including ChatGPT, Claude, Gemini, GPT-5/6, Llama, and more.

How can I verify real writing beyond an AI detection score?

Use Writing Replay for video proof of the writing process and pair it with the writing report for additional insights into authenticity and writing quality.

What plans and word limits does GPTzero offer?

Free includes 10,000 words/month with Basic AI Scan, plus 1 Free Advanced Scan and 5 Free AI Highlights in the Chrome extension. Premium is $12.99/month billed annually for 300,000 words/month, and Professional is $24.99/month billed annually for 500,000 words/month.