Step 5 Preview
StepFun
Step 5 Preview is StepFun’s flagship AI model for agentic coding, professional knowledge work, and financial analysis. Built on a sparse Mixture-of-Experts architecture with 600B total parameters and 27B active per token, it combines a 1M-token context window with vision input. From building interactive applications and debugging code to conducting research and producing analytical reports, it supports complex workflows that require sustained reasoning, tool use, and iterative refinement.
- Language
- Implicit caching
- Vision
- Context
- 1M
- Max output
- 1M
- Input / 1M
- $1.00
- Output / 1M
- $2.70
Quickstart
Point any OpenAI-compatible client at Maxynetic Systems and pass stepfun/step-5-preview as the model.
curl https://api.maxynetic.com/v1/chat/completions \
-H "Authorization: Bearer $MAXYNETIC_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "stepfun/step-5-preview",
"messages": [{ "role": "user", "content": "Explain routing in one line." }]
}'Pricing
Billed per token with no markup on the underlying provider rate.
Input
Per 1M prompt tokens
$1.00
Output
Per 1M completion tokens
$2.70
Cache read
Per 1M cached prompt tokens
$0.050
A 1M-token prompt with 250K tokens of output costs about $1.68.