StepFun

Chinese AI company building the Step foundation models

stepfun.comShanghai, China

StepFun is a Shanghai-based AI company founded in April 2023 by Jiang Daxin, Zhu Yibo and Jiao Binxing. It develops the Step series of language and multimodal models, including Step 3.5 Flash.

Language models

Step 5 Preview featured image

Step 5 Preview

0October 15, 2026

Step 3.7 Flash featured image

Step 3.7 Flash

0May 29, 2026

Step 3.5 Flash 2603

Step 3.5 Flash 2603

0April 2, 2026

Step 3.5 Flash

0February 12, 2026

Catalogue

All models by StepFun

Browse 4 models

Inference

Hosted by StepFun

StepFun
3 models · 3 endpoints

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