A 4-gigabyte AI model, identified as Gemini Nano, has been found integrated within Google Chrome's OptGuideOnDeviceModel folder, accessible since 2024. This on-device model aims to enable generative AI experiences without network connectivity or cloud data transmission, appealing to users prioritizing cost and privacy. Despite its local operation and impressive speed on a 2022 Apple M2 chip, testing revealed significant hallucinatory tendencies. When prompted with obscure trivia, character impersonations, or factual recall tasks, the model frequently generated incorrect or nonsensical responses, even persisting with unwanted personas. Google states Gemini Nano is intended for security features like scam detection and developer APIs, not for chatbot use, cautioning users against relying on it for conversational AI tasks.