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AI IntelligenceOct 15, 2026AI Intelligence

Article

StepFun releases open weights for Step 5 Preview, a 600B model with 27B active parameters

StepFun released open weights for its Step 5 Preview model, with 600B total and 27B active parameters and a 1M context window. It published a technical blog describing the model's 92-layer design, sparse grouped-query attention, and long-horizon agent training.

Frontier EditorialOct 15, 2026Source: Pandaily

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StepFun releases open weights for Step 5 Preview, a 600B model with 27B active parameters: StepFun released open weights for its Step 5 Preview model, with 600B total and 27B active parameters and a 1M context window. It published a technical blog describing the model's 92-layer design, sparse grouped-query attention, and long-horizon agent training.

StepFun Step 5 Open Weights AI Model Read the issue

Source Brief

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