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LLM Cost Engineering

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1 · Spending less on the same work

1Token economics of an agent fleet
Exercise answers
- Answer: Build a per-matter cost model from usage logs
- Answer: Calibrate the model against real token counts
2Prompt caching as system design
3Trimming and compacting context
4Batch, flex and fast tiers

2 · Changing the model, and governing the spend

5Cost-quality curves, routing and cascades
6Distilling into small models
7Self-hosting break-even
8Attribution, budgets and alerts

CapstoneCost-engineer an agent pipeline Reference implementation

Answers Lesson 1: Token economics of an agent fleet

Step-by-step answer

Core 60–90 min7 steps

Build a per-matter cost model from usage logs

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Next answer Calibrate the model against real token counts

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