Hi @martinn2,
This question is not completely related to the plugin, but to Open AI 🙂 Sp you absolutely need to check the Open AI website, your account there, your usage (there are links to all this throughout my plugin and documentation). My plugin also shows that usage in the Settings.
ChatGPT, their online chat, is currently usable for free, but one day it will be gone – it’s only here for testing purposes, and they are gathering data on how people are using it. It’s free for a reason 🙂 It’s a bit strange a lot of businesses are relying on it a bit too much, as it’s obviously going to disappear (or maybe they will offer the service against a monthly subscription, but it might be really expensive).
The Open AI (GPT) services are not free. That would be too good to be true 🙂 AI requires a huge (huuuge!) amount of server resources.