Overview
A sparse MoE model for fast reasoning, coding, and agent workflows, with 196B total parameters, 11B active per token, and 256K context.
Step 3.5 Flash
A sparse MoE model for fast reasoning, coding, and agent workflows, with 196B total parameters, 11B active per token, and 256K context.
MODEL NUMBER339
- First public date
- 2026-02-02
- Organization
- StepFun
- Family
- Step
01
Specifications
Only published specifications are shown.
02
Overview
Why it mattered
Step 3.5 Flash combines sparse activation, sliding-window attention, and multi-token prediction into an open model for real-world agent tasks.
PreviousStep 3321B · 66K ctx
CurrentStep 3.5 Flash196B · 256K ctx
04
Architecture & capabilities
Attention
Sliding Window AttentionFull Attention
Model capabilities
ReasoningCodingTool useLong context
Unclassified tags
Fast action
05
Release history
Step 3.5 Flash launched with open weights.
View source06
Related models
Select a card to view the related model.
07
Sources
Suggest a correction
Copy this template, add the field, proposed value, and primary source, and share it with the archive maintainer.