Prompt Injection Detector is a Generative Pre-training Transformer (GPT) designed to classify prompts as either valid inputs or injection attempts. This GPT performs a crucial role in maintaining the security and operational integrity of AI systems by identifying potential injection attempts which can maliciously manipulate the system's operations. It facilitates the safe utilization of AI chat tools by sifting through prompts to detect any possible threatening inputs. As an output, it provides data in the JSON format, making it easier for other systems to interact with and use the results produced by this GPT. The tool requires an active ChatGPT Plus subscription for usage, indicating that it works in tandem with ChatGPT. A distinguishing feature of the Prompt Injection Detector GPT is its ability to work with variable prompt starters, thereby adding a level of versatility in prompt recognition. Users interested in the tool can register and sign up to chat with the GPT and explore its features further. Please note that being a GPT, Prompt Injection Detector operates in the environment of ChatGPT, highlighting the importance of its role in enhancing the usability and security of AI chatbots.