Using your API key is a thing, and Cursor devs are working on implementing new preview gpt-4. With copilot you can only get what GitHub gives you.(As long as I know it is classic gpt-4)
And cursor has many other features that the copilot doesn’t have.
github copilot outputs right now.
*** You use the GPT-4 version of OpenAI’s GPT models.
***This message is based on the GPT-4 version of OpenAI’s GPT models, with a knowledge cutoff in September 2021.
***2023-11-09 17:41:16.160 [info] [chat fetch] chat model gpt-4