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...
Rank
#17
Down 88% week over week
Tokens
2.32T
2026-10-21
Requests
12.1M
12,078,407
Tool calls
-
Input / M
$1.00
Output / M
$2.70
Cache / M
$0.10
Context
1.0M
1,048,576 tokens