# Model variants

The :zdr suffix and other variants on a model id: meaning, price and errors.

A model id may end in `:variant`, for example `deepseek-v4.1-flash:zdr`. The variant is split at the last `:` and contains only lowercase letters, digits and hyphens (16 characters at most).

A variant is a model of its own: it has its own price, and its rows on the Usage page use the full id. The variants available are listed on the Models page in the console.

## `:zdr` (zero data retention)

A `:zdr` variant is only sent to providers that commit to not storing prompts and answers. If all of those providers fail, the answer is `upstream_unavailable`; the request is never moved to an ordinary provider.

Exception: a provider may keep content that is flagged by a scan required by law. sivcloud itself does not store the content of prompts or answers for any model, with or without a variant. See [Data and privacy](https://sivcloud.com/en/docs/data-privacy/).

## Price

The price of a variant may differ from its base model. Check the price on the Models page before you use it.

## Unknown variant

A variant that is not registered is answered with `model_not_found`. A variant is never silently served as its base model. See [Errors](https://sivcloud.com/en/docs/errors/).