Ghost AI detects and prevents sensitive data exposure through large language models by identifying private information in prompts and blocking transmission. It supports custom definitions for sensitive data and works with various LLMs including ChatGPT and Azure OpenAI. The solution can be deployed on-premises, as a service, or via cloud SaaS, requiring minimal hardware setup. It provides comprehensive logging of prompts, PII flagging, and integration with log management systems for audit purposes. To protect privacy, it substitutes sensitive data with fake information when interacting with LLMs.