---
title: Models
description: Use any AI SDK provider, or your own. Loom never routes model calls through a hosted service you did not choose.
---

Loom accepts any AI SDK language model. Install the provider you want and pass the model in.

```ts
import { openai } from "@ai-sdk/openai";

defineAgent({ model: openai("gpt-5") });
```

## Your own provider

A model is anything that implements the AI SDK's language model specification. That includes community providers, self-hosted endpoints that speak the OpenAI format, and providers you write yourself.

## Why not model strings?

Passing a string such as `"anthropic/claude-sonnet-5-5"` throws. In the AI SDK, a bare string can be resolved through a hosted gateway; Loom makes the provider explicit so every model call goes where you can see it.