Lesson 1967 of 2116
Using Prompt Caching to Cut Cost and Latency
Reuse the static prefix of long prompts across calls.
Lesson map
What this lesson covers
Learning path
The main moves in order
- 1The premise
- 2prompt-cache
- 3prefix
- 4cost
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Section 1
The premise
Long system prompts and few-shot examples are paid for again on every call unless you use prompt caching to reuse the prefix.
What AI does well here
- Cache static prefix tokens across calls within a TTL.
- Lower per-call latency on cached prefixes.
What AI cannot do
- Cache content that changes per call.
- Extend cache TTL beyond what the provider allows.
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