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Favicon for stepfun

stepfun

Access 1 stepfun model through the OpenRouter unified API including Step 3.5 Flash. Compare pricing, context windows, benchmarks, and capabilities between different stepfun models.

stepfun tokens processed on OpenRouter

  • Favicon for stepfun
    StepFun: Step 3.5 FlashStep 3.5 Flash
    493B tokens

    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. It is a reasoning model that is incredibly speed efficient even at long contexts.

by stepfunJan 29, 2026262K context$0.10/M input tokens$0.30/M output tokens