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StepFun: Step 5 Preview: AI model

Context window:
1,000,000 tokens
Input:
$1/1M tokens
Output:
$2.7/1M tokens
Type:
text, image, video
  • Vision
  • Tools
  • Streaming
  • Long context
Good for:Popular for Programming · #3Popular for Technology · #6Popular for Science · #7Popular for Finance · #15Ranks are based on global usage data

Thinking levels: Always thinks · high · medium · low

StepFun: Step 5 Preview is a AI model from StepFun, available through Hormouz via an OpenAI-compatible API with stable access from inside Iran.

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...

Quickstart

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

Specs

VendorStepFun
TypeText, Image, Video
Context window1,000,000 tokens
Pricing$1.00/M in · $2.70/M out
APIChat Completions
CapabilitiesStreaming · Vision · Tools

Code example

cURL
curl https://api.hormouz.net/v1/chat/completions \
  -H "Authorization: Bearer ng-YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "stepfun/step-5-preview",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'
Python
from openai import OpenAI
client = OpenAI(api_key="ng-YOUR_API_KEY", base_url="https://api.hormouz.net/v1")
response = client.chat.completions.create(
    model="stepfun/step-5-preview",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)
JavaScript
import OpenAI from "openai";
const client = new OpenAI({ apiKey: "ng-YOUR_API_KEY", baseURL: "https://api.hormouz.net/v1" });
const response = await client.chat.completions.create({
  model: "stepfun/step-5-preview",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);

Buy the StepFun: Step 5 Preview API, paid in rial

  • Buy credit with an Iranian bank card; no foreign card or account needed.
  • One Hormouz key reaches StepFun: Step 5 Preview and 600+ other models, and you pay only for what you use.
  • No VPN and no risk of a banned account; just change the base URL to api.hormouz.net/v1.
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Updated 2026-10-13