I need to correct myself. Gemini Fast do not rely on any internal compiler to validate code which allegedly creating. For FPC I'm certain, it fabricate false output, false FPC production date and code which fail to compile on real compiler. It seems to me Gemini Fast is just advanced text editor, copy and paste code from internet and trying to remove all what is not related for the matter of interest. And that is all.
It create code, post, when you said it do not work, it apologize saying: "You are right, I see what is the problem, I hallucinated, I losing Context Window..." or similar, it explain, "create" another variation and so on until you give up or said it works. As it deliberately provide series of test how "mouse behaves in the maze" or just bloat endless variations of found code "who knows where". No consistency, no nothing, except it can apologize with absurd reasons and explain correctly how something should work, but if coding is actually complex, it just lost itself.
It act as a fraudster. It is confident that can do, but when actually is asked to do anything more complex than "Hello world", you need to have a lot of patience or simply close the session. But in one thing it is relatively good and that is translating C sources to Pascal.
And that is it.