depends if you're running Opus for everything vs tiering. my pipeline: Haiku 4.5 for ~70% of implementation, Sonnet 4 for one review step, Opus 4.5 only for planning and final synthesis

claude code on opus continuously = whole bill. different measurement.

haiku 4.5 is good enough for fanout. opus earns it on synthesis where you need long context + complex problem solving under constraints