Why We Track LLM API Costs Per Task, Not Per Month

TL;DR: Switching from monthly-budget tracking to per-task cost attribution cut unexpected API overspend by 60% within six weeks.

The Context

We run automation, review, and outreach tasks through the same API pool. Monthly invoices looked predictable until we broke spend down by task type.

What We Tested

Tracking Method	Verdict	Why
Monthly invoice review	❌	Masked spike patterns in support triage workflow
Per-task attribution	✅	Found one workflow 3x more expensive per call than expected

The Pivot Point

A routine month-start reconciliation revealed that a low-volume support automation was consuming twice the cache tokens we’d budgeted for.

What We Use Now

We tag every automation by task family and run weekly arithmetic on token use before invoices arrive.

When You’d Choose Differently

If you run only one workload type against one vendor, monthly tracking is enough. Multi-workflow setups are not.

Tool Crucible Rating

8 / 10 — Overall 5 / 10 — Ease 8 / 10 — Value 7 / 10 — Support

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