This model is 21 months old. A newer version of it has since shipped: Step-3.7-Flash (2026-06-01). The details below are still accurate for this model — it just is not what we would recommend today.
Step-2
StepFun🇨🇳 China
StepFun's trillion-parameter MoE, ranked 1st among Chinese models on LiveBench at launch.
Context window16K tokens