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API budgeting checklist for LLM-powered features

Shipping an LLM feature without a budget line item is risky. Use this checklist with your team, then plug representative numbers into the calculator to produce a one-page estimate stakeholders can understand.

Checklist

Define the happy-path prompt and completion sizes, add a safety margin for retries and edge cases, pick candidate models, compute per-user and peak-day costs, and assign an owner to reconcile actuals against the invoice each month.