Step 5 Preview is StepFun’s flagship reasoning model for agentic work, with native text, image and video input and a 1M-token context window. It supports tool calling, structured output and long-document analysis for software engineering, finance and professional knowledge tasks. The model is served via the StepFun Open Platform API under the ID step-5-preview.

Read the official StepFun launch page

Worth opening first

Standouts

Playable

Hy Image 3.5 Preview

Generate and edit 2K images with multi-reference image support

Playable1

Playable

Hy Image 3.5 Preview

Generate and edit 2K images with multi-reference image support

Apps

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