Which GPT model is used by copilot.lua

[pidgeon777]

I am writing to inquire about the specific version of the Copilot model that is being utilized by copilot.lua. The existence of multiple versions of the Copilot model, as depicted in the image below, has piqued my interest.

In addition to this, I am also interested in knowing whether copilot.vim uses the same version of the model as copilot.lua.

Furthermore, I would like to know if there is a method to dynamically determine the version of the model being used, possibly through a command.

Lastly, I am curious to know if it is possible for the user to select a different model version for use.

[LorenzoBettini]

I'd be interested to.

I seem to understand that this is not documented at all?

[AntoineGS]

There are currently no options available (server-side), though maintainers of the official Copilot repos have mentioned wanting to add an API call to list available models at some point, not sure if it will ever happen 🤷 time will tell.

[LorenzoBettini]

So, which model is used? ChatGPT?

[AntoineGS]

Yeah it's currently GPT4o

[jinzhongjia]

now,gpt-41-copilot is available

[jinzhongjia]

I didn't know, but I set it manully

[pidgeon777]

I didn't know, but I set it manully

How?

[jinzhongjia]

may be more useful

[pidgeon777]

may be more useful

Yes I mean, how did you manually set the chosen autocompletion model?

It would have a great info to know 🙂.

[AntoineGS]

Pretty sure the LSP release I merged yesterday includes it, someone could ask on the official repo.
If I request an invalid model from the LSP it gives this error:

2025-08-28 10:06:05.758 [45] [ERROR]: LSP message: [default] User selected model gpt-44-copilot is not in the list of generic models: gpt-41-copilot, falling back to default model.

Since there is only one model I reckon it is the default.