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StepFunactive

Step 3.5 Flash

Released at: January 29, 2026

API StatusAvailable for integration
Context Window262,144 tokens
Input Price / MTok$0.10
Output Price / MTok$0.30

Model Overview

StepFun · Active Model

  • Long-Context
  • API Available
  • Production Ready

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....

Developer
StepFun
Release Date
January 29, 2026
Context Window
262,144 tokens≈ 350 words
API Access
Publicly AvailableIntegrate via official API
Input Cost
$0.10per million tokens
Output Cost
$0.30per million tokens
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