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How do you estimate the true cost of self-hosting an LLM versus paying per-token API?

The per-token sticker price hides the real decision. Self-hosting only wins past a volume break-even most teams misjudge. Here is the back-of-envelope a staff engineer does on the whiteboard.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

The per-token sticker price hides the real decision. Self-hosting only wins past a volume break-even most teams misjudge. Here is the back-of-envelope a staff engineer does on the whiteboard.

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LEARN THE BACKGROUND

These lessons teach the material this question tests, in order and from the beginning.

Applied AI Engineering·How language models work, enough to build onFree12mTokens: the unit everything else is priced inBefore you can reason about cost, latency, context limits, or chunk sizes, you need one mental model: the system charges you in tokens, not words. This lesson installs that habit and shows where it comes back in every later module.

UP NEXT ON YOUR JOURNEY

Next in this trackHow do you design stopping criteria and stop sequences for an LLM in production?Next in this trackChain-of-thought isn't improving accuracy on your task. What do you try next?Next in this trackYour tokenizer shreds domain terms into meaningless subwords. How do you fix it?

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