ドキュメント

import OpenAI from 'openai'

const client = new OpenAI({
  baseURL: 'https://api.thistoken.ai/v1',
  apiKey: 'your-api-key',
})

async function main() {
  const response = await client.chat.completions.create({
    model: 'gpt-4o',
    messages: [
      { role: 'user', content: 'Hello, how are you?' }
    ],
  })

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

main()