Does an LLM have subjective experience? The characters in The Sims -- or the game itself? A thermostat? An ant colony, collectively -- separate from its individual ants? The entire country of, say, Honduras, collectively? A corporation? A database? Bacteria? A human skin cell? A tumor, independent of its host? A traffic jam? Grains of sand in an hour glass? A tree? A flea? A dog?

You are asking questions that seem unanswerable. In order to know whether something is having an experience, you'd have to first define what an experience is. Is it possible to define something that fundamental like that from the perspective of a biological machine for everything including non biological machines and everything in between? It's much easier to define particles than such fuzzy things.

Once you define them, you will have to conceive experiments to test whether those definitions are wrong.

Why is my perception of the color red the way that it is?

You are different from other beings. You are an amalgamation of mutations of your parents, your environment, your upbringing, your place in time and space, the contents of body, and everything else. There is no need to invoke something extra-physicalist to explain that.