StepFun: Step 3.7 Flash

Technical Specifications

Model ID

stepfun-step-3.7-flash

Category

LLM Models

Task

Text Generation

Price

$0.675 per million tokens

Added

May 29, 2026

Key Features

• Chat completion and multi-turn conversation API
• Streaming response with token-by-token output
• Function calling and tool use support
• System prompts and role-based messaging
• JSON mode and structured output

Quick Start

Integrate StepFun: Step 3.7 Flash into your application with a single API call. Get your API key from the pricing page to get started.

import requests
import json

url = "https://modelslab.com/api/v7/llm/chat/completions"

headers = {
    "Content-Type": "application/json"
}

data = {
        "model_id": "stepfun-step-3.7-flash",
        "messages": [
            {
                "role": "user",
                "content": "Hello!"
            }
        ],
        "max_tokens": 1000,
        "key": "YOUR_API_KEY"
    }

try:
    response = requests.post(url, headers=headers, json=data)
    response.raise_for_status()  # Raises an HTTPError for bad responses (4XX or 5XX)
    result = response.json()
    print("API Response:")
    print(json.dumps(result, indent=2))
except requests.exceptions.HTTPError as http_err:
    print(f"HTTP error occurred: {http_err} - {response.text}")
except Exception as err:
    print(f"Other error occurred: {err}")

Pricing

StepFun: Step 3.7 Flash API costs $0.675 per million tokens. Plans start at $21/month, and open-source models are unlimited on the $149/month plan. View pricing plans

Use Cases

• AI chatbots and virtual assistants
• Code generation and developer tools
• Content writing and copywriting automation
• Data analysis, summarization, and extraction