Step-Audio is the first production-level open-source intelligent voice interaction framework, integrating voice understanding and generation capabilities. It supports multilingual dialogue, emotional intonation, dialects, speech rate, and prosodic style control. Its core technologies include a 130B parameter multimodal model, a generative data engine, fine-grained voice control, and enhanced intelligence. This framework promotes the development of intelligent voice interaction technology through open-source models and tools, and is suitable for a variety of voice application scenarios.