Last refreshed 2026-10-05. Next refresh: weekly.
Why use Step 5 Preview on StepFun?
StepFun offers Step 5 Preview with pay-as-you-go pricing at $1.00/1M input tokens. StepFun is a Chinese AI company providing API access to its Step series of large language and multimodal models.
Setup recipe
Docs fallbackUse the provider REST API or SDKCreate a provider API keymodel: step-5-previewstep-5-previewRequest example
step-5-preview.Gotchas
No curated gotchas have been sourced for this exact provider/model route yet.
Pricing
| 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.