Node.js：openaiパッケージをオープンウェイトモデルに向ける

import OpenAI from 'openai';

const client = new OpenAI({
  baseURL: 'https://llmwithcrypto.com/api/v1',
  apiKey: process.env.LLMWITHCRYPTO_API_KEY,
});

const resp = await client.chat.completions.create({
  model: 'deepseek-v4-pro',
  messages: [
    { role: 'system', content: 'Answer in two sentences.' },
    { role: 'user', content: 'What is a context window?' },
  ],
  max_tokens: 200,
});
console.log(resp.choices[0].message.content);
console.log(resp.usage.prompt_tokens, 'in,', resp.usage.completion_tokens, 'out');

import OpenAI from 'openai';

const client = new OpenAI({
  baseURL: 'https://llmwithcrypto.com/api/v1',
  apiKey: process.env.LLMWITHCRYPTO_API_KEY,
});

async function translate(text) {
  const resp = await client.chat.completions.create({
    model: 'qwen3-235b-a22b-instruct-2507',
    messages: [
      { role: 'system', content: 'Translate into Spanish. Reply with the translation only.' },
      { role: 'user', content: text },
    ],
    max_tokens: 200,
  });
  return resp.choices[0].message.content;
}

// at most 4 requests in flight
async function mapLimit(items, limit, fn) {
  const out = new Array(items.length);
  let next = 0;
  async function worker() {
    while (next < items.length) {
      const i = next++;
      out[i] = await fn(items[i]);
    }
  }
  await Promise.all(Array.from({ length: limit }, worker));
  return out;
}

const lines = ['Your order has shipped.', 'Your payment was received.', 'Your key was revoked.'];
console.log(await mapLimit(lines, 4, translate));

import OpenAI from 'openai';

const client = new OpenAI({
  baseURL: 'https://llmwithcrypto.com/api/v1',
  apiKey: process.env.LLMWITHCRYPTO_API_KEY,
});

const stream = await client.chat.completions.create({
  model: 'deepseek-v4.1-flash',
  messages: [{ role: 'user', content: 'Write a haiku about latency.' }],
  stream: true,
  stream_options: { include_usage: true },
  max_tokens: 120,
});
for await (const chunk of stream) {
  const text = chunk.choices[0]?.delta?.content;
  if (text) process.stdout.write(text);
  if (chunk.usage) console.log(`\n${chunk.usage.prompt_tokens} in, ${chunk.usage.completion_tokens} out`);
}

const res = await fetch('https://llmwithcrypto.com/api/v1/credits', {
  headers: { Authorization: `Bearer ${process.env.LLMWITHCRYPTO_API_KEY}` },
});
const credits = await res.json();
console.log('credit left:', credits.balance_usd, 'USD');