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AI IntelligenceSep 20, 2026AI Intelligence

Article

StepFun launches Step 5 Preview MoE model with weights open on October

StepFun has launched its Step 5 Preview model, featuring a 600-billion parameter sparse Mixture of Experts architecture with 27 billion active parameters. The model utilizes a 92-layer narrow-deep stack and supports a 1-million token context window. StepFun plans to open-source the weights on October 15.

Frontier EditorialSep 20, 2026Source: Pandaily

Source Brief

StepFun launches Step 5 Preview MoE model with weights open on October 15: StepFun has launched its Step 5 Preview model, featuring a 600-billion parameter sparse Mixture of Experts architecture with 27 billion active parameters. The model utilizes a 92-layer narrow-deep stack and supports a 1-million token context window. StepFun plans to open-source the weights on October 15.

AI Models StepFun Step 5 Preview Mixture of Experts open source Read the issue

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