There is a good definition of intelligence. It's what intelligence tests measure. If you define it like that, you can make harder tests, but as long as both humans and AIs can attempt to solve them we have measure and something to compare.
Consciousness though might be fully illusory and meaningless as many philosophical concepts before ultimately turned out to be.
> There is a good definition of intelligence. It's what intelligence tests measure.
what do intelligence tests measure?
Intelligent needs to bedefined with scales.
Cells are intelligent. Organs have intelligence on top of that, that cells do not have. Plants and animals have intelligence that their organs do not.
This is the real problem of intelligence, the definition one uses. It can cause them to be blind of all the things intelligence is capable of.