Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...
In / out price$1.00/$2.70per 1M tokens
Context
1M tokens
Parameters
Undisclosed
Modalities
→
Released
Oct 8, 2026
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