Medical Chat is an advanced AI assistant for human and veterinary healthcare. It provides instant medical answers, patient education, and drug information. The platform offers two main modes: Instant Answer for quick medical queries with follow-up suggestions, PubMed search, and custom prompt templates; and Diagnosis Report for generating differential diagnosis reports with clinic plans, patient education, and medication recommendations. It cites professional medical sources and searches PubMed articles. Veterinary support draws from over 2000 books and 10000 articles. The system is 100% HIPAA compliant with no chat history retained. It achieves high accuracy on USMLE (98.1%) and MedQA benchmarks. Designed for healthcare professionals to assist with daily diagnostic work.