Our take
Anyone can reach the same frontier models. What a competitor cannot copy is your definition of good and your proof that you hit it on every release. That is the quality loop, and it is the advantage that compounds.
Define good, then defend it
The loop is four moves. Know why a domain eval suite is the durable advantage. Turn your method into the archetypes, golden examples, and boundaries that say what good looks like. Decide what to measure each turn, and validate the grader before you trust it. Then gate every change on the suite, so a fix for one case cannot quietly break ten others.
Why it compounds
Every failure you catch in production becomes a permanent check the next change has to pass, so the same mistake cannot ship twice. A better model does not reset that. It gets re-scored against your bar, and the gain shows up where you can measure it. The pieces here walk the loop from why it matters to how you run it.