const res = await fetch('https://api.openai.com/v1/chat/completions', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    Authorization: `Bearer ${process.env.OPENAI_API_KEY}`,
  },
  body: JSON.stringify({
    model: 'gpt-4o-mini',
    messages: [{ role: 'user', content: 'Что такое HTTP GET одним абзацем?' }],
  }),
});

if (!res.ok) {
  throw new Error(`HTTP ${res.status}: ${await res.text()}`);
}

const data = await res.json();
console.log(data.choices[0].message.content);