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Open Weights

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Back to home • GEO summary endpoint

2026-10-15

Technology

  • 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 • Pandaily

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