GPTZero

What is GPTZero?

GPTZero is a leading AI identification tool designed to distinguish between human-written and machine-generated text. Founded in 2023, it specializes in detecting content from Large Language Models (LLMs) like ChatGPT, Claude, and Llama, focusing on transparency and academic integrity.

Key Features & Functionality

• Advanced AI Scanning: Uses a multi-step approach (7 components) to analyze text with 99% accuracy for modern models like GPT-4.
• Deep Analysis Metrics: Measures Perplexity (predictability of writing) and Burstiness (variation in sentence length and style).
• Writing Reports & Replay: Offers a "Writing Video" or replay feature to verify the actual human typing process.
• Plagiarism & Grammar Checking: Includes integrated tools to ensure originality and linguistic correctness.
• Platform Integrations: Provides extensions for Google Docs, Chrome, and Learning Management Systems like Canvas.
• ESL De-biasing: Specifically trained to reduce false positives for English Second Language learners.

Use Cases

• Education: Teachers and professors use it to maintain academic integrity; students use it to prove their work is authentic.
• Hiring & Recruitment: Screening cover letters or assessments for AI-generated content.
• Publishing & Marketing: Ensuring content is unique and carries a human "voice" to maintain SEO value and brand trust.
• Legal & Professional: Verifying the authorship of documents and reports.

FAQ Highlights

• Is it 100% accurate? No, but it claims 99% accuracy on modern LLMs and a 1% false positive rate for human text.
• Which models can it detect? It supports ChatGPT, GPT-4, GPT-5, Gemini, Claude, Llama, and Deepseek.
• Does it support other languages? Yes, it fully supports English, German, French, Portuguese, and Spanish.
• Can it detect "mixed" content? Yes, it can identify documents where human and AI writing are combined with 96.5% accuracy.