StepFun

3 models · 2 open weights · latest Oct 2026

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3 models

Step 5 Preview

Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). I

Closed$1.00/$2.701M tokensOct 2026

Step 3.7 Flash

StepFun

Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision enco

Open$0.20/$1.15262K tokens201.4B MoEMay 2026

Step 3.5 Flash

StepFun

Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activat

Open$0.10/$0.30262K tokens199.4B MoEJan 2026

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