Tip: Cross-Model Verification — Use a Different Model Family to Review Agent Plans at Checkpoints

GitHub Blog·medium signal

GitHub's Rubber Duck feature validates a pattern that any builder can adopt: before executing a complex agent plan, have a second model from a different family review it. The sweet spot is three checkpoints: after plan drafting, after complex implementation, and before test execution. This closes 74.7% of the quality gap between a cheaper and premium model. You don't need Copilot to apply this — route plan reviews through a different provider's API.