Most teams building AI agents default to running every step through the same frontier model. That is the most expensive possible architecture and often not the best-performing one either. The Plan-and-Execute pattern fixes this by separating the work that actually requires expensive reasoning f...
Source: [HackerNoon](https://hackernoon.com/you-do-not-need-claude-opus-for-every-step-here-is-how-to-cut-your-agent-costs-by-90percent?source=rss)