StepFun exposes Step 5 Preview through model ID step-5-preview. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.
Last refreshed 2026-10-05. Next refresh: weekly.
Quick Start
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- 3You'll be billed $1.00/1M input, $2.70/1M output tokens.
Code Examples
Pricing on StepFun
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.00 |
| Output tokens | $2.70 |
| Image input | $1.00 |
| Video input | $1.00 |
Capabilities
About Step 5 Preview
Step 5 Preview is StepFun's flagship model for agentic work, aimed at software engineering and professional knowledge work, with particular strength in finance. It is a sparse Mixture-of-Experts model with 600B total parameters and 27B active per token. It accepts text, image, and video input, outputs text, and supports a 1M-token context window with up to 64K output tokens. Through the StepFun Open Platform API (model ID step-5-preview) it supports streaming, tool calling, JSON mode and JSON Schema structured output, prompt caching, and low/medium/high reasoning effort, via Chat Completions and Messages APIs.