Step 3.5 Flash

StepFun text-only reasoning model built for agent use cases with an emphasis on speed; unlike Step 3.7 Flash it has no multimodal input.

Understands

text

This model cannot see images or video — you can only give it text. That matters if you planned to show it screenshots or documents with pictures.

Produces

text, code

Contents verified with the vendor: 2026-08-18

Included in subscriptions

No catalogue entry marks this model as part of a plan yet. It will appear here once the plan contents are confirmed with the vendor.