stepfun-ai/step-3.5-flash — Free AI Model & API

Overview

Quick Start

Integrate stepfun-ai/step-3.5-flash with 3 lines of code. See the config generator for Claude Code, Cursor, and more.

from openai import OpenAI

client = OpenAI(
    base_url="https://integrate.api.nvidia.com/v1",
    api_key="YOUR_API_KEY"
)

response = client.chat.completions.create(
    model="stepfun-ai/step-3.5-flash",
    messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)

import OpenAI from "openai";

const openai = new OpenAI({
  baseURL: "https://integrate.api.nvidia.com/v1",
  apiKey: "YOUR_API_KEY",
});

const completion = await openai.chat.completions.create({
  model: "stepfun-ai/step-3.5-flash",
  messages: [{ role: "user", content: "Hello!" }],
});

console.log(completion.choices[0].message.content);

curl https://integrate.api.nvidia.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "stepfun-ai/step-3.5-flash",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

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Rate Limits & Constraints

Features & Use Cases

How to Get a Free NVIDIA NIM API Key

Follow these steps to get your free API key for stepfun-ai/step-3.5-flash. No credit card required — just sign up and start using the API.

1. Sign up at build.nvidia.com Free NVIDIA Developer account. No credit card.
2. Go to Settings → API Keys
3. Generate an API key
4. Browse available models 100+ open models. Nemotron Super 49B recommended.
5. Configure OpenAI client Base URL: https://integrate.api.nvidia.com/v1

Playground — Test stepfun-ai/step-3.5-flash

Test stepfun-ai/step-3.5-flash directly in your browser. Your API key is sent directly to NVIDIA NIM — never stored.

Frequently Asked Questions

More questions? See our full FAQ →

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