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

# Providers

> 4 supported LLM providers: OpenAI, Anthropic, Google, Vercel AI SDK.

The SDK auto-detects provider type from the client object. No configuration needed.

## Supported providers

| Provider      | Client                            | Method intercepted            |
| ------------- | --------------------------------- | ----------------------------- |
| **OpenAI**    | `new OpenAI()`                    | `chat.completions.create`     |
| **Anthropic** | `new Anthropic()`                 | `messages.create`             |
| **Google**    | `new GoogleGenerativeAI()`        | `generateContent`             |
| **Vercel AI** | `openai` / `anthropic` / `google` | `generateText` / `streamText` |

## How it works

The SDK uses JavaScript `Proxy` to intercept LLM client methods. When you call `client.chat.completions.create(...)`, the proxy:

1. Runs all pre-hooks on the request
2. If no hook blocks → calls the original LLM method
3. Runs all post-hooks on the response
4. Returns the (potentially modified) response

The original client API is fully preserved — method signatures, return types, streaming, everything works as expected.