// OpenAI SDK — Node.js
import OpenAI from 'openai';

const openai = new OpenAI({
  apiKey: process.env.OPENAI_API_KEY,
});

const completion = await openai.chat.completions.create({
  model: 'gpt-4o',
  max_tokens: 1024,
  messages: [
    { role: 'system', content: 'You are a helpful assistant.' },
    { role: 'user', content: 'Explain API rate limiting.' },
  ],
});

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

// Google Gemini SDK — Node.js
import { GoogleGenerativeAI } from '@google/generative-ai';

const genAI = new GoogleGenerativeAI(
  process.env.GEMINI_API_KEY
);

const model = genAI.getGenerativeModel({
  model: 'gemini-2.0-flash',
});

const result = await model.generateContent(
  'Explain API rate limiting.'
);

console.log(result.response.text());

// Streaming with Anthropic — token-by-token output
const stream = await client.messages.stream({
  model: 'claude-sonnet-4-20250514',
  max_tokens: 2048,
  messages: [
    { role: 'user', content: 'Write a detailed guide.' }
  ],
});

for await (const chunk of stream) {
  if (chunk.type === 'content_block_delta') {
    process.stdout.write(chunk.delta.text);
  }
}

const final = await stream.finalMessage();
console.log('\nDone. Tokens:', final.usage);