Sonnet 5 is probably better than Opus 4.8 in many cases -- you may want to try it; I now use only Fable and Sonnet unless the task is explicitly one where Opus can't de-scope and be lazy (e.g. replicating exactly a system as a coarse model to be used for refactoring-and-lowering, (model system in Idris) is the last thing I used Opus for because it had no choice but to stay on scope).