Prompt caching can inflate your LLM bill: check write premiums, TTL and actual reuse
gethackteam · x · 2026-09-13
A practical reminder that prompt caching can cost extra if you keep paying to write a cache nobody reads:
- Check your provider's cache-write premium, expiry (TTL) and actual reuse rates
- A discounted cache-read price won't help if every request creates a fresh cache
- Anthropic, for example, defaults to a 5-minute TTL — meaning you may be losing money on their cache
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