PriceIndex
ST

Step 5 Preview

step-5-preview
APIProvider site

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... Built by StepFun.

Prices updated

Input price

$1.00

per 1M tokens · Standard

Output price

$2.70

per 1M tokens · Standard

Input limit

1M

tokens

Output limit

64K

tokens

Input formats

TextImageVideoAudioPDF

Output formats

TextImageVideoAudioPDF
Compare

Step 5 Preview price history

2 price records since 10/8/2026

Step 5 Preview cost calculator

Input20M tokens
Output5M tokens

$34/month

Standard pricing

    Overview

    What is Step 5 Preview?

    Step 5 Preview is a text & reasoning and vision model from StepFun. 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... Its 1M context window and $1.00 input price make it a candidate for quality-focused production applications.

    Image understandingDocument analysisContent workflowsClassification

    Rates

    Step 5 Preview pricing

    Pricing is based on token usage. Provider-specific caching, batch, regional, and tool charges may affect the final cost.

    Input · Standard

    $1.00

    Per 1M tokens

    Cached input · Standard

    $0.05

    Per 1M tokens

    Capabilities

    Step 5 Preview Tools

    Tools available when using Step 5 Preview through supported provider APIs.

    Function calling

    Supported

    Structured outputs

    Supported

    JSON mode

    Supported

    Reasoning

    Supported

    Built-in web search

    Not supported

    Log probabilities

    Supported

    Deterministic seed

    Not supported

    Parallel tool calls

    Not supported

    Prompt caching

    Supported

    Strengths and limitations

    Strengths

    • Priced at $1.00 input and $2.70 output per million tokens.
    • 1M context supports large documents, repositories and extended conversations.
    • Supports text & reasoning and vision workloads in one model.

    Limitations

    • Real-world cost still depends on prompt length, response length and provider-specific billing rules.
    • Large context capacity does not guarantee consistent retrieval across the entire prompt.
    • Arena Elo and MMLU-Pro are directional; test accuracy, latency and reliability on your own workload before committing.

    Arena Elo, MMLU-Pro and pricing figures are illustrative; validate current vendor terms before purchase.

    Same provider

    More models from StepFun

    View provider →
    262K

    $0.10 in · $0.30 out

    View model
    262K

    $0.20 in · $1.15 out

    View model

    Frequently asked questions about Step 5 Preview

    Step 5 Preview is a text & reasoning and vision model from StepFun. 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...