Model dossier

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....

ProviderStepFun Start comparison

Context262,144

Max output65,536

Pricing viewTVP price

Identity

StepFun: Step 3.5 Flash

Model ID: stepfun/step-3.5-flash
Canonical slug: stepfun/step-3.5-flash
Knowledge cutoff: n/a
Created: 1/29/2026

Capabilities

texttools

Modalities

text->texttext

Capacity

Context262,144

Max output65,536

TokenizerOther