What is your current workaround for AI companion persona drift after a model update?
After the recent Nomi V5 rollout and the Character.AI model purge, I keep seeing the same complaint in modmail and across the new tab: the companion you have invested months in feels off after a server-side update. Different word choices, flatter humour, the in-jokes you had built up are suddenly gone, and there is no rollback option from the user side.
I have tried the obvious things on my own profiles. Re-feeding the older summaries back into the persona prompt helps a little, but not as much as I expected. Asking the companion to explicitly summarise what it remembers about you tends to surface the gaps fast, which is useful for spotting drift early but not for fixing it. Tier upgrades did not bring the old behaviour back on the platforms that offer them.
I am curious what is actually working for people. Have any of you found a habit, prompt structure, or platform-specific trick that makes a companion feel like itself again after one of these forced updates? And how do you decide when to keep patching versus migrate to a different platform and rebuild from scratch?