What AI model to use?

Choosing the wrong model can be 5x more expensive. But how to choose the correct one? I use Opus to help me plan a full feature. It is the equivalent of a seasoned Sr. Software Engineer who knows how to find gaps in a code base. Knows when to ask questions and drive you in the right direction. I use Sonnet for simple feature implementations. To write code previously planned by a more expensive model. Sonnet is your mid level engineer who knows how to code but doesn't have architectural expertise. I use Haiku for classification, labeling, and Yes/No questions. Haiku is just a calculator for nondeterministic values. "Is this picture a car?" Opus plans > Sonnet codes > Haiku answers More in [aguilera.ee](https://aguilera.ee)