Ship this prompt as an app: the one-file pattern
ship-fastpatternopusprototype
Opus 4.8~$0.030 / call
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Multi-step JSON repair: make any model return valid JSON on the second try
multi-stepjsonrepairsonnet
Sonnet 4.6~$0.012 / call
A 5-line eval that catches 80% of hallucinations
evalhallucinationhaikuguardrails
Haiku 4.5~$0.001 / call
Cheap-then-deep routing: Haiku 4.5 first, Opus 4.7 only when it earns it
routinghaikuopuscost
Haiku 4.5 → Opus 4.7~$0.004 / call