# Step 5 Preview

StepFun



Flagship for agentic work; reasoning_effort low/medium/high; pay-as-you-go $1.00 cache-miss / $0.05 cache-hit in, $2.70 out per 1M tokens; strong on finance and software engineering per official positioning


## Availability

API step-5-preview \(platform.stepfun.ai / platform.stepfun.com\); available on Step Plan; open weights planned 2026-10-15
- Model released: Sep 20, 2026 · Date only
- Review updated: Sep 21, 2026 00:40 Mon · Beijing Time (UTC+8)

## Sources

- Step 5 Preview docs \(EN\): https://platform.stepfun.ai/docs/en/guides/models/step-5-preview
- Pricing and Rate Limits: https://platform.stepfun.ai/docs/en/guides/pricing/details
- Step 5 Preview product page: https://www.stepfun.com/step-5-preview

Canonical entry: https://www.ailyre.com/source/?id=stepfun-step-5-preview&lang=en