OpenRouter

from openai import OpenAI

client = OpenAI(
    base_url="https://openrouter.ai/api/v1",
    api_key="your_api_key_here",  # or use env var
)

response = client.chat.completions.create(
    model="stepfun/step-3.5-flash:free",
    messages=[
        {"role": "user", "content": "Hello! How are you?"}
    ]
)

print(response.choices[0].message.content)

import OpenAI from 'openai';

const client = new OpenAI({
  baseURL: 'https://openrouter.ai/api/v1',
  apiKey: process.env.API_KEY ?? 'your_api_key_here',
});

const response = await client.chat.completions.create({
  model: 'stepfun/step-3.5-flash:free',
  messages: [
    { role: 'user', content: 'Hello! How are you?' }
  ],
});

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