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Stepfun

Step 3.5 Flash

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....

Capabilities:

Input
  • Text input
  • Image input (vision)
  • File input (PDF)
  • Audio input
  • Video input
Output
  • Text output
  • Image output
  • Audio output
Pricing & availability:

  • OpenRouterOpenRouter

    $0.09 / $0.3 per M
Sources:
OpenRouterOpenRouter
Share:
Details:

  • StepfunProvider

    StepFun

  • Context window

    262K

  • Input price

    $0.09/M

  • Output price

    $0.3/M

  • Open weights

    Yes

  • Released

    Jan 2026