OpenMAIC: OpenMAIC (Open Multi-Agent Interactive Classroom) is an open-source AI platform developed by the THU-MAIC team at Tsinghua University. It is designed to transform online education by moving from passive video lectures to active, personalized, and social AI-driven classrooms. Using Large Language Model (LLM) orchestration and multi-agent collaboration via LangGraph, it generates complete interactive lessons from any topic or document. The platform simulates an authentic classroom with AI teachers, assistants, and classmates who engage in real-time discussions, debates, and lectures. It features a two-stage generation pipeline that creates multimedia content including slides, quizzes, interactive HTML simulations, and project-based learning activities.