CCDV-F objective 5.4 · Domain 5 · 16.8% of the exam
Cost and Token Management
Where the money actually is. Caching pays from roughly the second or third read and loses on a prefix used once, and its discount reaches input only. A cached prefix still occupies the window in full, so it buys price and prefill speed rather than headroom. The asynchronous path is the structural lever for work nobody is waiting on. Forecasts built from counted input under-read the bill, because output carries the higher rate and is the half you cannot count in advance.
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The rest of domain 5: Model Selection and Optimization
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