GPTZero is an AI content detection platform designed to identify text generated by large language models such as ChatGPT, GPT-4, Claude, Gemini, LLaMA, and other AI writing systems. Founded in January 2023 by Edward Tian and Alex Cui while students at Princeton University, and headquartered in New York City, GPTZero was one of the first AI detection tools to gain widespread attention following the release of ChatGPT. The platform analyzes text using multiple detection methods including perplexity analysis, which measures how predictable text is to a language model, and burstiness analysis, which examines the variation in sentence complexity throughout a document. Human-written text typically exhibits higher variability in both measures compared to AI-generated content. GPTZero provides sentence-level and document-level detection scores, highlighting specific passages most likely to be AI-generated so users can understand exactly which portions of a document may not be human-written. The platform supports detection of content from all major AI writing models and is regularly updated to handle newer models and techniques. GPTZero serves multiple use cases beyond academic integrity, including publishing, content marketing, hiring, and legal applications where verifying the human origin of text is important. The platform offers a web-based interface for pasting or uploading text, a browser extension, integrations with learning management systems like Canvas and Turnitin, and an API for programmatic access. GPTZero also provides writing reports that analyze documents for AI involvement and origin tracing that can identify which AI model likely generated a piece of text. The platform offers a free tier with limited scans, a Pro plan starting at $10 per month for educators and writers, and custom API and enterprise pricing for organizations requiring higher volume access.
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