This model is 23 months old. A newer version of it has since shipped: Step 5 Preview (2026-10-08). 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