HuatuoGPT-o1-8B is a large language model (LLM) specifically designed for advanced medical reasoning. Before providing a final response, it generates a complex thinking process that reflects and refines its reasoning. Built on the LLaMA-3.1-8B framework, it supports English language input and employs a 'thinks-before-it-answers' approach, producing outputs that include both the reasoning process and final response. This model is significant in the medical field as it can address complex medical issues and provide well-considered answers, critical for enhancing the quality and efficiency of medical decision-making.