It is actually quite well defined: https://en.wikipedia.org/wiki/Fluid_and_crystallized_intelligence https://en.wikipedia.org/wiki/Fluid_and_crystallized_intell

It is actually quite well defined: https://en.wikipedia.org/wiki/Fluid_and_crystallized_intelligence https://en.wikipedia.org/wiki/Fluid_and_crystallized_intelli... LLMs are lacking in fluid intelligence and there is even a good benchmark for it called the abstract reasoning corpus.