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

# Overview

> OpenAI Compatible API authentication, endpoints, and supported models

## Base URL

```
https://api.pipellm.ai/v1
```

## Authentication

| Header          | Value                     |
| --------------- | ------------------------- |
| `Authorization` | `Bearer $PIPELLM_API_KEY` |

## Endpoints

| Type             | Endpoint                    |
| ---------------- | --------------------------- |
| Chat Completions | `POST /v1/chat/completions` |
| Responses        | `POST /v1/responses`        |

## Supported Models

**OpenAI**

* `gpt-4.1` / `gpt-4.1-mini` (latest)
* `gpt-4o` / `gpt-4o-mini`
* `o3` / `o4-mini` / `o4-mini-high` (reasoning models)

**Grok (xAI)**

* `grok-3` (latest)
* `grok-2` / `grok-2-mini`

**DeepSeek**

* `deepseek-chat`
* `deepseek-coder`
* `deepseek-reasoner`

**Groq**

* `llama-3.1-70b-versatile`
* `mixtral-8x7b-32768`

For the complete model list, see the [OpenAI Models documentation](https://platform.openai.com/docs/models).

## Choose Your Integration

<Columns cols={3}>
  <Card title="Chat Completions" icon="comments" href="/api-reference/openai/chat-completions">
    OpenAI SDK including Function Calling
  </Card>

  <Card title="Responses" icon="sparkles" href="/api-reference/openai/responses">
    OpenAI Responses API
  </Card>

  <Card title="LangChain (OpenAI)" icon="link" href="/integrations/langchain-openai">
    Framework integration guide
  </Card>
</Columns>