>Even if they collectively only release a new model every few years for the sake of influence and public image, that's plenty enough to keep the competitive aspect going.

This is unpersuasive. Why would AI companies (American or Chinese) stop subsidizing tokens, but keep doing open model releases? At least for the former you can argue it's a lead generation tool for enterprise contracts (eg. hobbyist uses claude code personal plan, then asks the company to buy claude code enterprise, which are billed at API rates), but what's the business case for doing open model releases? You might get some mindshare, but are also arming your competitors in the process. Moreover what makes you think the model releases will be at all competitive to frontier models? Google released gemma 4 a few weeks ago to acclaim, but it's in no way competitive to even GPT-5.4 or Opus 4.6.