Step 3.7 Flash

stepfun/step-3.7-flash

by StepFun

Input price: $0.2/ M tokens
Output price: $1.15/ M tokens
Context window: 256Ktokens
Max output: 250Ktokens

Step-3.7-Flash is StepFun's flagship high-efficiency multimodal reasoning model, built on a sparse Mixture-of-Experts architecture (198B total / ~11B active parameters) that delivers high throughput and low latency for real-time agentic workflows and high-frequency calls. It natively understands images and video — no extra vision model needed in agent frameworks — and offers a 256K context window with three selectable reasoning levels (low/medium/high) to balance speed, cost and reasoning depth. With reliable multi-step tool calling, task decomposition and plan execution, it excels at coding, solution planning and vision-to-workflow tasks, producing complete plans in a single call.

Features

Serverless API

Docs

stepfun/step-3.7-flash is available via Novita's serverless API, where you pay per token. There are several ways to call the API, including OpenAI-compatible endpoints with exceptional reasoning performance.

Available Serverless

Run queries immediately, pay only for usage

Input$0.2 / M Tokens

Cache Read$0.04 / M Tokens

Output$1.15 / M Tokens

Get your API key
Sign up and create a key to run the code below. The API is OpenAI-compatible.
Log in Get your API key

Make your first request

The API is OpenAI-compatible: point any OpenAI SDK at the base URL and pass this model ID.

Base URL: https://api.novita.ai/openai
Model ID: stepfun/step-3.7-flash
API Endpoint: chat/completions

1from openai import OpenAI
2
3client = OpenAI(
4    api_key="<Your API Key>",
5    base_url="https://api.novita.ai/openai"
6)
7
8response = client.chat.completions.create(
9    model="stepfun/step-3.7-flash",
10    messages=[
11        {"role": "system", "content": "You are a helpful assistant."},
12        {"role": "user", "content": "Hello, how are you?"}
13    ],
14    max_tokens=256000,
15    temperature=0.7
16)
17
18print(response.choices[0].message.content)