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Guides

Practical planning guides for AI API budgets and routing.

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14 articles in Guides

2026-07-31How prompt caching reduces LLM API costs

Separate stable prefixes from dynamic tokens, estimate hit rate, and account for cache-write fees when planning spend.

2026-07-31Choosing models by latency vs API cost

How to set a latency SLO, compare planning p50 latency with list prices, and avoid overpaying for speed you do not need.

2026-07-31Unit economics for SaaS AI features

Connect token costs, adoption, and pricing so AI features stay within a healthy COGS band.

2026-07-31Convert USD AI API bills to GBP, EUR, AUD, and CAD

How UK, EU, Australian, and Canadian teams should budget OpenAI and Anthropic invoices that arrive in dollars.

2026-07-31When self-hosted LLMs beat API pricing

Compare GPU-hour economics to hosted token prices, and know which assumptions flip the decision.

2026-07-31How API rate limits shape LLM cost and capacity

RPM, TPM, concurrency, and daily caps decide your real ceiling—often before list price does.

2026-07-31Allocate AI API budget across team seats

Use role weights and hard caps so a few power users do not consume the whole monthly AI pool.

2026-07-31How to estimate PDF and document ingestion cost

Turn pages into tokens, account for chunk overlap, and decide when an LLM extract pass is worth the spend.

2026-07-31How to price A/B and cascade model routing

Estimate LLM spend when you split traffic or escalate hard cases from a cheap primary to a premium model.

2026-07-31How to estimate multi-provider failover cost

Price an availability path: primary success rate, failed-attempt billing, and secondary spend during blips or outages.

2026-07-31How to estimate LLM-as-judge eval cost

Break eval spend into candidate generation and judge scoring—and see why rubric dimensions multiply the bill.

2026-07-31How to estimate synthetic data generation cost

Price generate → critique → filter pipelines and understand why accept rate drives over-generation spend.

2026-07-31When does a RAG re-ranker pay for itself?

LLM rerank adds calls, but feeding top-N instead of top-K into the generator can cut context tokens enough to win overall.

2026-07-30How to estimate LLM API costs before you ship

A practical framework for turning traffic assumptions into monthly OpenAI, Anthropic, and Google API spend.