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---
title: V4.2.1
description: Upgrade guide from older versions to FastGPT V4.2.1
---
For self-hosted deployments with a custom configuration file, you need to update the `VectorModels` field. Add `defaultToken` and `maxToken` — these correspond to the default token count for direct chunking and the maximum token limit supported by the model (generally recommended not to exceed 3000).
```json
"VectorModels": [
{
"model": "text-embedding-ada-002",
"name": "Embedding-2",
"price": 0,
"defaultToken": 500,
"maxToken": 3000
}
]
```
The rationale behind this change is that there's no need to offer multiple choices — just pick the most suitable model for the task.