Model dossier

StepFun: Step 5 Preview

Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...

ProviderStepFun Start comparison

Context1,000,000

Max output64,000

Pricing viewTVP price

Identity

StepFun: Step 5 Preview

Model ID: stepfun/step-5-preview
Canonical slug: stepfun/step-5-preview-20261008
Knowledge cutoff: n/a
Created: 10/8/2026

Capabilities

textimagevideotoolsstructured

Modalities

text+image+video->texttextimagevideo

Capacity

Context1,000,000

Max output64,000

TokenizerOther