Using the ChatGPT API

Creating an OpenAI Account

https://platform.openai.com/account/

Registering a Credit Card

https://platform.openai.com/account/billing/overview

Set up paid account → I'm an individual

Setting a Payment Limit Just in Case

https://platform.openai.com/account/billing/limits

Creating an API Key

https://platform.openai.com/account/api-keys

Making a Request with Rest Client

POST https://api.openai.com/v1/chat/completions
Content-Type: application/json
Authorization: Bearer sk-....

{
  "model": "gpt-3.5-turbo",
  "messages": [{
    "role": "user",
    "content": "Please tell me 10 delicious dishes that have been trending in the past year."
  }]
}

Response

{
  "id": "chatcmpl-6....m",
  "object": "chat.completion",
  "created": 1678513287,
  "model": "gpt-3.5-turbo-0301",
  "usage": {
    "prompt_tokens": 32,
    "completion_tokens": 483,
    "total_tokens": 515
  },
  "choices": [
    {
      "message": {
        "role": "assistant",
        "content": "\n\n1. Dalgona Coffee - A latte-style drink made by pouring a frothy mixture of coffee, sugar, and water over milk.\n2. Sweet Potato Toast - A sweet dish featuring sweet potato paste, marshmallows, and caramel sauce on toast.\n3. Homemade Yakiniku - A popular dish for home parties and family gatherings, where you can easily make yakiniku at home.\n4. Overnight Oats - A breakfast drink made by mixing oats and almond milk and letting it sit overnight.\n5. Quinoa Balls - A snack made by mixing quinoa and nuts with dates and shaping them into balls.\n6. Tarte aux Fraises - A French tart topped with fruit.\n7. Vegan Seafood - Vegan food designed to mimic seafood.\n8. Marshmallow Brown - A s'mores-style dessert made with chocolate, marshmallows, and graham crackers.\n9. Superfood Smoothie - A smoothie mixed with healthy superfoods.\n10. Hot Pot - A traditional Asian dish where raw meat and vegetables are cooked in hot soup."
      },
      "finish_reason": "stop",
      "index": 0
    }
  ]
}

Pricing

$0.002 (approximately 0.3 yen) / 1K tokens So, for this one request, it costs about 0.15 yen.

Impressions

I think it depends on the model, but it is significantly slower than using it on the web.

API Documentation

https://platform.openai.com/docs/api-reference/chat/create