All Models

StepFun 3.5 Flash

ReasoningTool CallingOpen Weights

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....

Providers1
ReleasedJan 29, 2026
Input Modalitiestext, image
Output Modalitiestext
Tarsk Usecoding

Benchmarks

17
Intelligence Index

Available Providers (1)

ProviderModel IDInput CostOutput CostContextMax OutputDocs
Vercel AI Gatewaystepfun/step-3.5-flash$0.09/MTok$0.30/MTok262.1K262.1K

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output