---
title: createProviderRegistry
description: Registry for managing multiple providers and models (API Reference)
---

# `createProviderRegistry()`

When you work with multiple providers and models, it is often desirable to manage them
in a central place and access the models through simple string ids.

`createProviderRegistry` lets you create a registry with multiple providers that you
can access by their ids in the format `providerId:modelId`.

### Setup

You can create a registry with multiple providers and models using `createProviderRegistry`.

```ts
import { anthropic } from '@ai-sdk/anthropic';
import { createOpenAI } from '@ai-sdk/openai';
import { createProviderRegistry } from 'ai';

export const registry = createProviderRegistry({
  // register provider with prefix and default setup:
  anthropic,

  // register provider with prefix and custom setup:
  openai: createOpenAI({
    apiKey: process.env.OPENAI_API_KEY,
  }),
});
```

### Custom Separator

By default, the registry uses `:` as the separator between provider and model IDs. You can customize this separator by passing a `separator` option:

```ts
const registry = createProviderRegistry(
  {
    anthropic,
    openai,
  },
  { separator: ' > ' },
);

// Now you can use the custom separator
const model = registry.languageModel('anthropic > claude-3-opus-20240229');
```

### Language models

You can access language models by using the `languageModel` method on the registry.
The provider id will become the prefix of the model id: `providerId:modelId`.

```ts highlight={"5"}
import { generateText } from 'ai';
import { registry } from './registry';

const { text } = await generateText({
  model: registry.languageModel('openai:gpt-4.1'),
  prompt: 'Invent a new holiday and describe its traditions.',
});
```

### Text embedding models

You can access text embedding models by using the `.embeddingModel` method on the registry.
The provider id will become the prefix of the model id: `providerId:modelId`.

```ts highlight={"5"}
import { embed } from 'ai';
import { registry } from './registry';

const { embedding } = await embed({
  model: registry.embeddingModel('openai:text-embedding-3-small'),
  value: 'sunny day at the beach',
});
```

### Image models

You can access image models by using the `imageModel` method on the registry.
The provider id will become the prefix of the model id: `providerId:modelId`.

```ts highlight={"5"}
import { generateImage } from 'ai';
import { registry } from './registry';

const { image } = await generateImage({
  model: registry.imageModel('openai:dall-e-3'),
  prompt: 'A beautiful sunset over a calm ocean',
});
```

## Import

<Snippet text={`import { createProviderRegistry } from "ai"`} prompt={false} />

## API Signature

### Parameters

<PropertiesTable
  content={[
    {
      name: 'providers',
      type: 'Record<string, Provider>',
      description:
        'The unique identifier for the provider. It should be unique within the registry.',
      properties: [
        {
          type: 'Provider',
          parameters: [
            {
              name: 'languageModel',
              type: '(id: string) => LanguageModel',
              description:
                'A function that returns a language model by its id.',
            },
            {
              name: 'embeddingModel',
              type: '(id: string) => EmbeddingModel<string>',
              description:
                'A function that returns a text embedding model by its id.',
            },
            {
              name: 'imageModel',
              type: '(id: string) => ImageModel',
              description: 'A function that returns an image model by its id.',
            },
          ],
        },
      ],
    },
    {
      name: 'options',
      type: 'object',
      isOptional: true,
      description: 'Optional configuration for the registry.',
      properties: [
        {
          type: 'Options',
          parameters: [
            {
              name: 'separator',
              type: 'string',
              isOptional: true,
              description:
                'Custom separator between provider and model IDs. Defaults to ":".',
            },
            {
              name: 'languageModelMiddleware',
              type: 'LanguageModelMiddleware | LanguageModelMiddleware[]',
              isOptional: true,
              description:
                'Middleware to wrap all language models obtained from the registry.',
            },
            {
              name: 'imageModelMiddleware',
              type: 'ImageModelMiddleware | ImageModelMiddleware[]',
              isOptional: true,
              description:
                'Middleware to wrap all image models obtained from the registry.',
            },
          ],
        },
      ],
    },
  ]}
/>

### Returns

The `createProviderRegistry` function returns a `Provider` instance. It has the following methods:

<PropertiesTable
  content={[
    {
      name: 'languageModel',
      type: '(id: string) => LanguageModel',
      description:
        'A function that returns a language model by its id (format: providerId:modelId)',
    },
    {
      name: 'embeddingModel',
      type: '(id: string) => EmbeddingModel<string>',
      description:
        'A function that returns a text embedding model by its id (format: providerId:modelId)',
    },
    {
      name: 'imageModel',
      type: '(id: string) => ImageModel',
      description:
        'A function that returns an image model by its id (format: providerId:modelId)',
    },
  ]}
/>