> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt.

## AI search model update

search, ai

Ask Fern now uses [Claude 4.6 Sonnet](https://www.anthropic.com/news/claude-sonnet-4-6) and [Claude 4.5 Haiku](https://www.anthropic.com/news/claude-haiku-4-5).

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## Link to API Reference sections with `api:` syntax

api-reference

The `api:` link syntax now supports linking to the root of an API Reference section. Use `api:apiName` to create a link that resolves to the landing page of a specific API Reference at build time. This is useful when your project has multiple APIs.

**`Markdown`**

```mdx Markdown
Explore the Plant Store API reference.
```

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