Step 5 Preview

stepfun/step-5-preview

by StepFun

Input price: $1/ M tokens
Output price: $2.7/ M tokens
Context window: 977Ktokens
Max output: 63Ktokens

Step 5 Preview is StepFun's flagship model for coding, software engineering, and professional knowledge work. Its sparse MoE architecture uses 600B total and 27B active parameters, with a 1M-token context window and up to 64K output tokens. It accepts text, images, and video and supports tool calling, structured JSON output, three reasoning effort levels, streaming, and prompt caching.

Fonctionnalités

API sans serveur

Documentation

stepfun/step-5-preview 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.

Sans serveur disponible

Exécutez des requêtes immédiatement, ne payez que pour l’utilisation

Entrée$1 / M Tokens

Lecture du cache$0.1 / M Tokens

Sortie$2.7 / M Tokens

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

Base URL: https://api.novita.ai/openaihttps://api.novita.ai/anthropic
Model ID: stepfun/step-5-preview
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-5-preview",
10    messages=[
11        {"role": "system", "content": "You are a helpful assistant."},
12        {"role": "user", "content": "Hello, how are you?"}
13    ],
14    max_tokens=64000,
15    temperature=0.7
16)
17
18print(response.choices[0].message.content)