> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# OpenRouter TypeScript SDK

> Type-safe TypeScript toolkit for building AI features against 400+ models through OpenRouter.

The OpenRouter TypeScript SDK is a type-safe toolkit for building AI-powered
features in any JS or TS runtime, giving you access to 400+ models across
providers through a single unified API.

## Installation

```bash npm theme={null}
npm add @openrouter/sdk
```

```bash pnpm theme={null}
pnpm add @openrouter/sdk
```

```bash bun theme={null}
bun add @openrouter/sdk
```

```bash yarn theme={null}
yarn add @openrouter/sdk
```

<Note>
  This package is published as an ES Module (ESM) only. For applications using
  CommonJS, use `await import("@openrouter/sdk")` to import and use this package.
</Note>

## Quickstart

```typescript theme={null}
import { OpenRouter } from "@openrouter/sdk";

const openRouter = new OpenRouter();

const result = await openRouter.chat.send({
  messages: [
    {
      role: "user",
      content: "Hello, how are you?",
    },
  ],
  model: "openai/gpt-5",
  provider: {
    zdr: true,
    sort: "price",
  },
  stream: true,
});

for await (const chunk of result) {
  console.log(chunk.choices[0].delta.content);
}
```

## API reference

Browse the API reference for each resource in the sidebar. Type definitions for
every request, response, model, and operation are linked inline from each
resource page.