Model release · StepFun

Step 5 Preview

Model released: Sep 20, 2026 · Date only
Review updated: Sep 21, 2026 00:40 Mon · Beijing Time (UTC+8)

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

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Source trace

Reviewed by Ailyre. Source evidence is presented separately from our summary.

Step 5 Preview docs (EN)

StepFun

Source checked: Sep 20, 2026 12:30 Sun · Beijing Time (UTC+8)

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Pricing and Rate Limits

StepFun

Source checked: Sep 20, 2026 12:30 Sun · Beijing Time (UTC+8)

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Step 5 Preview product page

StepFun

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