system
A chat on subreddit /r/me_irl
human
I've answered questions like this before, so I'll try to explain it from my point of view, as someone who does not have an internal dialogue.

We don't think in words, and we don't think in pictures. We think in concepts.

I'm not saying we're all math geniuses, but certainly I was. I just understood what was going on without having to remember things or have voices in my head explain to me how to solve something. Geometry, Algebra, Calculus—they just made sense. Doesn't mean I could figure these things out without being taught, but it meant once someone showed me something, I got it. To this day—I'm in my 50s—I can still solve math problems I haven't seen since the 1980s. It's not that I remember how to solve them; it's that I understand the problem and can think through the concepts to figure out how to solve.

But the downside is that I'm not as good verbally as others. I'm slower than others at putting thoughts into words and even at translating words into thoughts. Some people have responses before I've even fully comprehended what was said.

I'm not speaking for others who do not have internal dialogues, but this is my own experience.
gpt
I have an internal monologue and am good at math. To me math is just like a language, and I can think in "math" similar to thinking in German