Step 5 Preview

Chat Completions

step-5-preview

StepFun|Created Oct 17, 2026|1.0M context

Chat Completions

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 knowledge work, with particular strength in finance.

Overview Specifications Activity Performance Uptime Examples API Reference

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Throughput

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Time-To-First-Token (TTFT)

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