No. GPTZero works across a wide range of AI language models, including but not limited to ChatGPT, GPT-5, GPT-4, GPT-3, Gemini, Claude, Llama, Deepseek, and AI services based on those models. Our detector is designed for the highest accuracy rate regardless of which model may have produced the text. In our latest model release, we have updated the majority of our training data, including more AI documents from OpenAI (GPT4.1, GPT4.1-mini, o3, o3-mini), Gemini (2.5 Pro, 2.5 Flash, 2.5 Flash-Lite), Claude (Sonnet 4) as well as a few other models.

You can start using GPTZero straight away in 3 easy steps: Paste Text or Upload Document: Paste in raw text or upload your file for review and press 'Scan'. For scans over 10,000 characters, create a free account first. See Your Results: GPTZero will suggest what percentage of your text is likely to be AI-generated and highlight the specific phrases it has detected. Download our Chrome Extension for Google Docs and web: View AI detection and typing pattern metrics on any page, allowing you to spot AI-created content with ease.

Yes. Independent benchmarks, like our partners at Penn State's AI Research Lab, and our own large-scale testing show that GPTZero is the most accurate AI detector, with a 99% accuracy rate when spotting AI-generated text vs. human writing. This means we correctly classify AI writing 99 out of 100 times and keep misclassification of text to an absolute minimum. Our results were further validated on RAID, a comprehensive, third-party benchmark where GPTZero was shown to be the most accurate AI detector in North America, detecting 95.7% of AI texts while only incorrectly predicting 1% of human te