Monumental, like the invention of language or math, but not like a god.
Now, I feel even just "OK" agential AI would represent god-like abilities. Being able to spawn digital homunculi that do your bidding for relatively cheap and with limited knowledge and skill required on the part of the conjuror.
Again, this is very subjective. You might feel that god-like means an entity that can build Dyson Spheres and bend reality to it's will. That is certainly god-like, but just a much higher threshold than what I'd use.