Langup is a Python framework that combines LLMs (OpenAI GPT, ChatGPT) with LangChain to create autonomous social bots. It powers a Bilibili live stream “digital person” (VtuBer) that responds to viewer comments in real time, supporting video @ auto-replies, private message bots, terminal chat, and voice interaction. The bot can be configured with a system prompt persona and runs an event loop to continuously process incoming social interactions.