Step 5 Preview
Stepfun馃嚚馃嚦
stepfun/step-5-previewStep 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters).
Cost rate
0.6x
Context
1M
Released
Oct 8, 2026
Input
TextImageVideo
Output
Text
Support
ReasoningTool callingStructured outputs
Best at
The categories where this model ranks highest.
Image understanding
#45 路 top 28%
Business, Management, & Finance
#66 路 top 16%
Mathematical
#66 路 top 17%
Software & IT Services
#67 路 top 16%
Performance
Median latency and throughput measured across recent requests.
Throughput87 tok/s
Latency