How much does Step 5 Preview cost?

Step 5 Preview is billed pay-as-you-go at $1.10 per 1M input tokens and $2.97 per 1M output tokens. There is no subscription — you only pay for what you use.

What can Step 5 Preview do?

Step 5 Preview supports Vision, Tool calling.

Is Step 5 Preview free to use?

Step 5 Preview is a paid, pay-as-you-go model — no subscription, you are only charged for usage.

How do I use Step 5 Preview via the API?

Step 5 Preview is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID step-5-preview with your Api.Airforce API key.

Who makes Step 5 Preview?

Step 5 Preview is StepFun's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.

StepFunPaidOperational

Step 5 Preview

API model name: step-5-preview

Step 5 Preview is StepFun's chat model, served on the Api.Airforce unified API. Capabilities include Vision, Tool calling. It is priced at $1.10 per million input tokens and $2.97 per million output tokens. That is below the provider's $1.00 official input rate. Access it through the OpenAI-compatible API with one key, alongside 100+ other models on Api.Airforce.

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Pricing

Input / 1M tokens

$1.10

Output / 1M tokens

$2.97

Cache read / 1M tokens

$0.11

Official input rate

$1.00

Official output rate

$2.70

Api.Airforce price vs. the provider's official rate.

Specifications

Provider: StepFun
Type: chat model

Capabilities

VisionTool calling

What is Step 5 Preview used for?

Chatbots & assistants — conversational AI, drafting, summarizing and Q&A.
Image understanding — analyze photos, screenshots, charts and scanned documents.
Agents & automation — function calling and tool use for multi-step workflows.

Step 5 Preview vs. similar models

Model	Intelligence	Context	Input / 1M	Output / 1M
Step 5 Preview	—	—	$1.10	$2.97
Step 3.5 Flash	17.0	—	$0.11	$0.33
Step 3.7 Flash	19.5	—	$15.60	$15.60
GPT-5.4 Pro	—	—	$15.00	$90.00

Prices are Api.Airforce pay-as-you-go rates per 1M tokens. Context is the maximum input length.

Step 5 Preview — frequently asked questions

How much does Step 5 Preview cost?: Step 5 Preview is billed pay-as-you-go at $1.10 per 1M input tokens and $2.97 per 1M output tokens. There is no subscription — you only pay for what you use.
What can Step 5 Preview do?: Step 5 Preview supports Vision, Tool calling.
Is Step 5 Preview free to use?: Step 5 Preview is a paid, pay-as-you-go model — no subscription, you are only charged for usage.
How do I use Step 5 Preview via the API?: Step 5 Preview is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID step-5-preview with your Api.Airforce API key.
Who makes Step 5 Preview?: Step 5 Preview is StepFun's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.

All models·Quickstart·Chat API reference

Use Step 5 Preview via the API

OpenAI-compatible — point any OpenAI SDK at https://api.airforce/v1 and pass step-5-preview as the model.

cURL

curl https://api.airforce/v1/chat/completions \
  -H "Authorization: Bearer $AIRFORCE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "step-5-preview",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'

Python

from openai import OpenAI
client = OpenAI(base_url="https://api.airforce/v1", api_key="$AIRFORCE_API_KEY")
r = client.chat.completions.create(
    model="step-5-preview",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(r.choices[0].message.content)

JavaScript

import OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://api.airforce/v1", apiKey: process.env.AIRFORCE_API_KEY });
const r = await client.chat.completions.create({
  model: "step-5-preview",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(r.choices[0].message.content);