---
title: persistent
framework: coreai
role: symbol
role_heading: Type Property
path: coreai/aimodelcache/policy/persistent
---

# persistent

A policy that prevents automatic purging of specialized assets.

## Declaration

```swift
static let persistent: AIModelCache.Policy
```

## Discussion

Discussion This policy ensures the system does not purge specialized assets until the next OS update. You can manually delete them, but the system does not automatically purge them under low storage or when the source .aimodel changes.