StepFun
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Models
Step-3.5-Flash-Base
StepFun
Mar 2026
Step-3.5-Flash
StepFun
196B total / 11B active open-source MoE under Apache 2.0 with 256K context and high efficiency.
Context262K
Feb 2026
Open weightsStep-2
StepFun
StepFun's trillion-parameter MoE, ranked 1st among Chinese models on LiveBench at launch.
Context16K
Nov 2024