11 min read
Cut Claude API spend by up to 90% with prompt caching. Real numbers, TypeScript SDK code, and the gotchas Anthropic's docs gloss over.
PROMPT CACHING
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Prompt Caching Economics on Fable 5: When the 5-Minute TTL Pays
Fable 5 prompt caching economics: cache-write vs cache-read pricing, 5-minute vs 1-hour TTL break-even math, and worked agent-loop examples.
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