---
title: AI SDK Core
description: Reference documentation for the AI SDK Core
collapsed: true
---

# AI SDK Core

[AI SDK Core](/docs/ai-sdk-core) is a set of functions that allow you to interact with language models and other AI models.
These functions are designed to be easy-to-use and flexible, allowing you to generate text, structured data,
and embeddings from language models and other AI models.

AI SDK Core contains the following main functions:

<IndexCards
  cards={[
    {
      title: 'generateText()',
      description: 'Generate text and call tools from a language model.',
      href: '/docs/reference/ai-sdk-core/generate-text',
    },
    {
      title: 'streamText()',
      description: 'Stream text and call tools from a language model.',
      href: '/docs/reference/ai-sdk-core/stream-text',
    },
    {
      title: 'Output',
      description: 'Structured output types for generateText and streamText.',
      href: '/docs/reference/ai-sdk-core/output',
    },
    {
      title: 'embed()',
      description:
        'Generate an embedding for a single value using an embedding model.',
      href: '/docs/reference/ai-sdk-core/embed',
    },
    {
      title: 'embedMany()',
      description:
        'Generate embeddings for several values using an embedding model (batch embedding).',
      href: '/docs/reference/ai-sdk-core/embed-many',
    },
    {
      title: 'generateImage()',
      description:
        'Generate images based on a given prompt using an image model.',
      href: '/docs/reference/ai-sdk-core/generate-image',
    },
    {
      title: 'experimental_generateVideo()',
      description:
        'Generate videos based on a given prompt using a video model.',
      href: '/docs/reference/ai-sdk-core/generate-video',
    },
    {
      title: 'experimental_transcribe()',
      description: 'Generate a transcript from an audio file.',
      href: '/docs/reference/ai-sdk-core/transcribe',
    },
    {
      title: 'experimental_generateSpeech()',
      description: 'Generate speech audio from text.',
      href: '/docs/reference/ai-sdk-core/generate-speech',
    },
  ]}
/>

It also contains the following helper functions:

<IndexCards
  cards={[
    {
      title: 'tool()',
      description: 'Type inference helper function for tools.',
      href: '/docs/reference/ai-sdk-core/tool',
    },
    {
      title: 'createMCPClient()',
      description: 'Creates a client for connecting to MCP servers.',
      href: '/docs/reference/ai-sdk-core/create-mcp-client',
    },
    {
      title: 'jsonSchema()',
      description: 'Creates AI SDK compatible JSON schema objects.',
      href: '/docs/reference/ai-sdk-core/json-schema',
    },
    {
      title: 'zodSchema()',
      description: 'Creates AI SDK compatible Zod schema objects.',
      href: '/docs/reference/ai-sdk-core/zod-schema',
    },
    {
      title: 'createProviderRegistry()',
      description:
        'Creates a registry for using models from multiple providers.',
      href: '/docs/reference/ai-sdk-core/provider-registry',
    },
    {
      title: 'cosineSimilarity()',
      description:
        'Calculates the cosine similarity between two vectors, e.g. embeddings.',
      href: '/docs/reference/ai-sdk-core/cosine-similarity',
    },
    {
      title: 'simulateReadableStream()',
      description:
        'Creates a ReadableStream that emits values with configurable delays.',
      href: '/docs/reference/ai-sdk-core/simulate-readable-stream',
    },
    {
      title: 'wrapLanguageModel()',
      description: 'Wraps a language model with middleware.',
      href: '/docs/reference/ai-sdk-core/wrap-language-model',
    },
    {
      title: 'wrapImageModel()',
      description: 'Wraps an image model with middleware.',
      href: '/docs/reference/ai-sdk-core/wrap-image-model',
    },
    {
      title: 'extractReasoningMiddleware()',
      description:
        'Extracts reasoning from the generated text and exposes it as a `reasoning` property on the result.',
      href: '/docs/reference/ai-sdk-core/extract-reasoning-middleware',
    },
    {
      title: 'extractJsonMiddleware()',
      description:
        'Extracts JSON from text content by stripping markdown code fences.',
      href: '/docs/reference/ai-sdk-core/extract-json-middleware',
    },
    {
      title: 'stepCountIs()',
      description:
        'Creates a stop condition that triggers after a specified number of steps.',
      href: '/docs/reference/ai-sdk-core/step-count-is',
    },
    {
      title: 'hasToolCall()',
      description:
        'Creates a stop condition that triggers when a specific tool is called.',
      href: '/docs/reference/ai-sdk-core/has-tool-call',
    },
    {
      title: 'isLoopFinished()',
      description:
        'Creates a stop condition that lets the agent loop run until it naturally finishes.',
      href: '/docs/reference/ai-sdk-core/loop-finished',
    },
    {
      title: 'simulateStreamingMiddleware()',
      description:
        'Simulates streaming behavior with responses from non-streaming language models.',
      href: '/docs/reference/ai-sdk-core/simulate-streaming-middleware',
    },
    {
      title: 'defaultSettingsMiddleware()',
      description: 'Applies default settings to a language model.',
      href: '/docs/reference/ai-sdk-core/default-settings-middleware',
    },
    {
      title: 'smoothStream()',
      description: 'Smooths text and reasoning streaming output.',
      href: '/docs/reference/ai-sdk-core/smooth-stream',
    },
    {
      title: 'generateId()',
      description: 'Helper function for generating unique IDs',
      href: '/docs/reference/ai-sdk-core/generate-id',
    },
    {
      title: 'createIdGenerator()',
      description: 'Creates an ID generator',
      href: '/docs/reference/ai-sdk-core/create-id-generator',
    },
  ]}
/>