It’s boggles my mind that enterprises or SaaS wouldn’t be following release cycles of new models to improve their service and/or cost. Although I guess there’s enterprises that don’t do OS upgrades or pathing too, just alien to me.

They're almost never straight upgrades for the exact same prompts across the board at the same latency and price. The last time that happened was already a year ago, with 3.5 Sonnet.