GPU Economics: Cost Modeling, Utilization Math, and Build vs Buy

Every senior engineer running LLMs eventually faces "are we spending too much?" or "can we self-host?" The conversations that go badly are the ones where neither side has a model. The conversations that go well are the ones where someone walks in with a spreadsheet that ties workload tokens/sec, GPU utilization, hosted-API blended price, and 3-year TCO together — and that someone is the senior engineer who shaped the LLM strategy.

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