Cut the cost of a model call

This call costs more than I'd like: <paste the prompt and roughly how
often it runs>

Work through, in order of impact:
- What's in the prompt that isn't earning its place? Show me the cut.
- Is the stable part of this prompt cacheable by my provider? If so,
  how do I structure it to hit the cache?
- Would a smaller model handle this? Say which part of the task
  actually needs the larger one.
- Can I avoid the call entirely for some inputs — a cache, a rule, an
  early exit?
- Is the output longer than it needs to be? Constrain it.

Estimate the saving for each, and tell me which one to do first.