Opus 5 comes with five effort settings: low, medium, high, xhigh, max. Most people seem to be reaching straight for max, and at least on coding work that looks like the wrong move. On FrontierCode, scores fall above the high setting. The stated reason is that the model starts making unnecessary refactors and edits outside the scope it was given. Anthropic's own migration guide in the system card warns about diminishing returns and overthinking on simpler tasks, so this is not some outside crit...