Microsoft and OpenAI seem to be going through a slow-motion divorce, so OpenAI may well end up using whatever data centers they are building for training as wel

Microsoft and OpenAI seem to be going through a slow-motion divorce, so OpenAI may well end up using whatever data centers they are building for training as well as inference, but $500B (or even $100B) is so far beyond the cost of current training clusters, that it seems this number is more a reflection on what they are hoping the demand will be - how much they will need to spend on inference capacity.