Pull-request review costs reportedly cut by 90% with open-weight models

One user says switching to open-weight models cut their pull-request review costs by 90%. They recommend sorting AI tasks into three buckets: low entropy, such as choosing a reviewer; medium entropy, such as reviewing a pull request; and high entropy, such as writing one. In their view, the first doesn't need frontier models, the second can use a hybrid approach, and only the third needs frontier models.