I've had some success with using a more expensive model to plan a decent work breakdown structure in a document and then a low-cost model to implement the plan

I've had some success with using a more expensive model to plan a decent work breakdown structure in a document and then a low-cost model to implement the plan and keep following-up, but wonder about subsequent need for code review and code quality. Can a lower-cost model verify completion? Iff tests and test coverage and e2e tests? The same oracle / model routing and partitioning problem