Step model releases

StepFun's high-efficiency multimodal sparse-MoE successor to Step-3.5-Flash: a ~196B-total / ~11B-active vision-language model with native image and video understanding, a 256K context, and selectable reasoning tiers (high/medium/low). Tuned for coding agents and search workflows.

StepFun's Apache-licensed sparse MoE model for fast agentic execution, coding, math, browsing, and tool-use workflows.

Second-generation StepFun foundation model line with larger-scale multimodal and reasoning ambitions.

StepFun's first major vision-language model, released after the Step-1 language model.

StepFun's first public foundation model generation, introduced as a trillion-parameter Chinese model line.