Why it matters

Cost control prevents budget shocks. Standard for prod LLM.

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The architecture

Track: tokens in + out per call.

Cost: model price table.

Cap: reject if over budget.

Cost control flowTrack spendper user + sessionCompare to capbudget checkAllow or refuseover-budget = blockRedis atomic INCR for shared counters; alert on approaching cap
Cost control.
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How it works end to end

Price tables per model.

Real-time spend counters (Redis).

Caps: hard + soft.

Alerts + downgrade paths.