Step 5 Preview
NEWStepFun · Proprietary · Released Oct 8, 2026 · stepfun/step-5-preview
Best $1.00 in / $2.70 out via StepFun · fp8
1M contextVisionToolsReasoningStructured outputPrompt caching
Available from 1 providerUSD / MTOK · PRICES 25 MINUTES AGO
EST. MONTHLY COSTclick a row for detail · click headers to sort
| PROVIDER | INPUT | OUTPUT | CACHE | CONTEXT | QUANT | TTFT | TPS | UPTIME |
|---|---|---|---|---|---|---|---|---|
 StepFun1ST PARTY | $1.00 | $2.70 | $0.05 | 1M | fp8 | — | — | 100.0% |
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Pricing variants · USD / MTok in / out
STANDARD
$1.00 / $2.70
per MTok in / out
CACHE READ $0.05
Recent changesRSS ↗
Oct 9, 2026model added
About
Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...
Specifications
Context window1,000,000
Max output64,000
Modalities intext, image, video
Modalities outtext
LicenseProprietary
ReleasedOct 8, 2026
TokenizerOther
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[](https://modelindex.ai/models/stepfun/step-5-preview)Sources
OpenRouter API25 minutes ago
AGGREGATORVerified 25 minutes ago · list prices, not negotiated rates.