On January 16, 2025, Shanghai Step Stars Intelligent Technology Co., Ltd. announced the official launch of its self-developed inference model, Step Reasoner mini (referred to as 'Step R-mini'). Users can log in to the Yuewen web portal at https://yuewen.cn and select 'Step R-mini' in the upper left corner to experience it. Step R-mini is the first inference model in the Step series family, excelling in active planning, experimentation, and reflection through slow thinking and repeated validation.