GPTZero

GPTZero is a leading artificial intelligence detection and document verification platform engineered to identify synthetic text generated by large language models. Developed specifically for educators, academic institutions, editorial publishers, and human resource professionals, the software brings transparency and academic integrity to modern written communications.

The platform analyzes written submissions using statistical metrics such as perplexity and burstiness, which measure sentence complexity and rhythmic variance across text blocks. GPTZero detects writing generated by ChatGPT, GPT-4, Claude, Gemini, and Llama, highlighting individual sentences likely generated by AI alongside a comprehensive probability score. The system also includes an integrated writing history report that verifies authentic student editing sessions inside Google Docs.

GPTZero is accessible as a web-based scanner, an API for enterprise platforms, and a browser extension for Google Docs and Chrome. The platform offers a free tier for casual scans alongside monthly and institutional subscription plans offering high-volume batch scanning, plagiarism checking, and API access.