It does not.

From the GPL terms:

To “modify” a work means to copy from or adapt all or part of the work in a fashion requiring copyright permission, other than the making of an exact copy.

Other licenses may be more permissive and do allow you to do pretty much whatever you want with it, but I don't see why feeding some source code into an LLM would exempt you from its license.

It doesn't matter if it's you reading it or an LLM doing inference on it, you're still taking the source code as a starting point to create a derived work based on it and as such you are subject to its license.