I've haven't looked into how these new AI products are implemented. Can someone give a ballpark estimate on the current costs if someone wanted to build their o

I've haven't looked into how these new AI products are implemented. Can someone give a ballpark estimate on the current costs if someone wanted to build their own, say: 1. LLM that talks like ChatGPT 2. Image generator that makes realistic portraits from verbal descriptions. Are the costs in the data acquisition, human training input, training CPU/GPU hours, hardware, or ??