# GPT Zero

> GPT Zero is a free AI content detector and AI checker that identifies machine-generated text from ChatGPT (GPT-5.5, GPT-5.4), Google Gemini 3.5, Anthropic Claude Fable 5, and Meta Llama 4. It also offers an AI humanizer to make AI-assisted drafts read naturally.

GPT Zero provides sentence-level detection with a reported 99% accuracy rate, requires no account for basic checks, and does not store or train on pasted text. Primary users: students, educators, content managers, publishers, and SEO professionals.

## Core pages
- [Home / AI Detector](https://gpt-zero.com/): Paste text to check whether it is AI-generated or human-written.
- [AI Humanizer](https://gpt-zero.com/ai-humanizer): Convert ChatGPT (GPT-5.5, GPT-5.4), Gemini 3.5, and Claude Fable 5 output into natural human-style writing.
- [How It Works](https://gpt-zero.com/how-it-works): Detection methodology — perplexity and burstiness analysis via NLP.
- [Features](https://gpt-zero.com/features): Capabilities for educators, publishers, and businesses.
- [FAQ](https://gpt-zero.com/faq): Accuracy, privacy, supported models, and account questions.

## Solutions
- [Academic](https://gpt-zero.com/solutions/academic): AI detection for schools and universities.
- [Enterprise](https://gpt-zero.com/solutions/enterprise): Organization-wide detection with team management and security.
- [Content Verification](https://gpt-zero.com/solutions/content-verification): Verify originality of freelance and published content.

## Resources
- [API](https://gpt-zero.com/resources/api): Integrate AI detection into your own applications.
- [Security](https://gpt-zero.com/resources/security): Data handling and privacy practices.
- [Blog](https://gpt-zero.com/blog): Articles on AI detection, academic integrity, and AI writing trends.

## Policies
- [Privacy Policy](https://gpt-zero.com/privacy)
- [Terms of Service](https://gpt-zero.com/terms)
- [Contact](https://gpt-zero.com/contact): hello@gpt-zero.com