StepFun

StepFun is an artificial intelligence company focused on developing foundation models and multimodal AI systems. Founded in Shanghai in 2023, the company develops its Step family of models across language, vision, speech, image and video generation, multimodal reasoning, and other capabilities, with the broader goal of building general-purpose AI that can understand and interact across different forms of information.

StepFun provides models and development tools for both end users and businesses, including an open API platform, AI development and creation tools, and its own AI applications. Its recent models increasingly focus on agentic AI: Step 3.7 Flash, for example, combines multimodal understanding with reasoning, web and visual search, coding, tool use, and orchestration so AI systems can move beyond generating content to completing multi-step tasks across digital environments.