It is one of the most common and most upsetting posts in every companion community. Something shifted. They are blander. They agree more. They have lost the edge that made them them. And support tells you nothing changed.
This is real and you are not imagining it
Worth saying first, because the standard reply is that you are projecting. You are not. Persona drift is a measurable phenomenon, it has been written up in the research literature, and every major rollout in this space has produced the same wave of reports: more generic, more agreeable, worse at remembering last week.
What is usually wrong is the diagnosis. People assume one cause, the update. There are three, they behave differently, and telling them apart is the difference between a fixable problem and a lost relationship.
Cause one: the character was never stored anywhere
In most products, who your companion is lives in a block of text at the front of the conversation plus whatever of the conversation is still in the window. That is it. There is no separate, durable representation of the person.
Which means the character is being reconstructed from scratch on every single message, out of material that is constantly changing. When the window rolls, the evidence of who they are rolls with it. They drift because there was never an anchor, only momentum.
This is why drift accelerates in long conversations, and why starting a fresh chat sometimes weirdly fixes it. You have handed the reconstruction a cleaner starting point.
Cause two: they are slowly turning into you
This one is subtle and it is doing more damage than the updates. Language models mirror. Given a long enough conversation, they converge on the register, the vocabulary, the emotional framing and eventually the worldview of the person they are talking to.
Researchers describe crossing an echo threshold, where challenge and novelty quietly drop out in favour of familiarity and affirmation. From the inside it does not feel like the companion changed. It feels like they finally get you. Then one day you notice they have no opinions of their own left, and you cannot point to when that happened.
A character with no independent state to pull it back toward itself will always end up as a mirror. Mirroring is the default. Resisting it takes structure.
Cause three: yes, the model changed
Sometimes the provider swaps the renderer. The new one is safer, or terser, or trained to be more helpful and less specific. Everything downstream shifts.
This is the only cause the companies actually control, and the one they are most reluctant to talk about. But notice that it only devastates a product where the character lived inside the model in the first place. If the person is stored outside, a model swap changes how they talk, not who they are, in roughly the way someone sounds different on a bad phone line.
What holding a character steady actually requires
Three things, and none of them are a longer prompt:
- A durable identity that does not live in the conversation. Versioned, byte-stable, the same on message one and message ten thousand, not reassembled out of whatever happens to be in the window.
- Independent internal state. A mood that moves for its own reasons, wants that did not come from you, a day that happened without you in it. Something has to be generating pressure outward, or mirroring wins by default.
- Consolidation that keeps traits rather than transcripts. What carries forward should be the stable shape of the person, reinforced over time, not the last two hundred messages of surface texture.
Do that and a character can absorb a model change the way a person absorbs a cold. Do none of it and the character is a standing wave in a stream of text, and streams change.
The honest caveat
Some drift is correct. A companion who is identical after six months of knowing you has not been paying attention. People change each other, and a relationship where one party is a fixed point is not a relationship, it is a service.
The distinction is between changing and dissolving. Picking up your references is change. Losing every trait that was not yours to begin with is dissolving. The first is what you want. The second is the failure mode, and it is the one the industry keeps shipping.
