| Product | GPT Version | Description |
| OpenAI AI Classifier | 3 | A classifier trained to distinguish between text written by a human and text written by AIs from a variety of providers. |
| HuggingFace GPT-2 Output Detector | 2 | Based on the GPT-2 output detector model from OpenAI |
| Writer AI Content Detector | Unknown | Designed to help with search engine page ranking and avoiding content that is flagged if it reads like it was entirely produced by AI. |
| GPTHero | Unknown | GPTHero is simply a demonstration of the limitations of AI detection software. |
| GPTZero | 3 | GPTZero turns the very technologies used to build ChatGPT around — to detect AI. It uses variables like perplexity to fingerprint AI involvement. Stay updated on the upcoming innovations in GPTZero technology via this substack. |
| DetectGPT | 2 | DetectGPT is a general-purpose method for using a language model to detect its own generations; however, this proof-of-concept only detects if a particular piece of text came from GPT-2 |