StepFun

Step 5 PreviewNEWStepFun

Step 5 Preview is an agentic model especially suited to software engineering, finance, long-document analysis, multimodal understanding, and tool-assisted research.

Step 3.7 FlashStepFun

Step 3.7 Flash is a multimodal Mixture-of-Experts model from StepFun with text, image, and video understanding. It supports a 256K context window and is optimized for fast inference, reasoning, agent workflows, and long-context productivity tasks.