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I don't think ChatGPT is available via APIs. Most unofficial APIs are headless browser

Is this even legal?

The only thing here is instead of copy-pasting it into ChatGPT, you get to use a browser extension that does the job. Pretty convenient actually.

So technically, we are still using https://chat.openai.com/chat, with the UI

This guy [1] (on twitter) says they are using Davinci 003, and claiming it is what ChatGPT uses.

ChatGPT is in fact just a chat prompt on top of Davinci3, plus a markdown renderer

Do we know what the prompt is?

The posts of comments to chatgpt reference davinci-002