A — 0: We compare token or GPU prices alone. B — 1: We include hosting and some labour, but review, retries, support or low-volume conditions are missing. C — 2: The ledger includes one-off and recurring costs, common denominators and downside scenarios.
Evidence to attach: cost workbook with measured/assumed labels and dated price references. If weak: instrument review time and retries before discussing payback. An expensive exception path can dominate a cheap main model.