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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
    unknown
    Version
    —
    Context
    262K
    Parameters
    —
    License
    —

    Step 3.5 Flash is StepFun’s open-weight text reasoning model for coding, tool use and high-throughput workloads. It remains available alongside the multimodal Step 3.7 Flash and the newer Step 5 Preview.

  2. Step 3.7 FlashOpen-weight
    unknown
    Version
    —
    Context
    256K
    Parameters
    198B
    License
    Apache-2.0

    Step 3.7 Flash is an open-weight vision-language MoE model with 198B total parameters and about 11B active per token. It combines a 196B language backbone with a 1.8B vision encoder, supports a 256K context and offers low, medium and high reasoning settings.

About StepFun (阶跃星辰)

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