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step-3 by StepFun (阶跃星辰)

2 tracked versions of the step-3 family. Timeline ordered newest → oldest. Flagship version marked.

Version timeline

  1. Step 3.5 FlashFlagshipOpen-weight
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    Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....

  2. unknown
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    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 encoder for native image and video understanding, activating roughly 11B parameters...

About StepFun (阶跃星辰)

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