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

# Completion API Overview

> Provider-compatible completion endpoints for OpenAI, Anthropic, Google, and Mistral models through one Langdock API key

The Completion API gives you provider-compatible completion endpoints through one Langdock API key. Each endpoint follows the official specification of its provider, so you can use existing SDKs and clients by changing the base URL.

## Before You Start

* **API key**: To use the API, create a [personal API key](/en/using-langdock/account/personal-api-keys) or ask your workspace admin for a workspace API key with the Completion API scope.
* **Regions**: Each endpoint includes a `{region}` path segment. See the endpoint pages for the supported regions and how to list the models available in your workspace.

## Base URL

```
https://api.langdock.com
```

<Warning>
  **Dedicated deployments**

  Replace `api.langdock.com` with `<your-deployment-url>/api/public` in all requests.
</Warning>

## Available Endpoints

| Method | Endpoint                                          | Description                                                       |
| ------ | ------------------------------------------------- | ----------------------------------------------------------------- |
| `POST` | `/openai/{region}/v1/chat/completions`            | [OpenAI Chat Completions](/en/developer/completion-api/openai)    |
| `POST` | `/openai/{region}/v1/responses`                   | [OpenAI Responses](/en/developer/completion-api/openai-responses) |
| `POST` | `/anthropic/{region}/v1/messages`                 | [Anthropic Messages](/en/developer/completion-api/anthropic)      |
| `POST` | `/google/{region}/v1beta/models/{model}:{action}` | [Google Gemini](/en/developer/completion-api/google)              |
| `POST` | `/mistral/{region}/v1/fim/completions`            | [Mistral Codestral](/en/developer/completion-api/mistral)         |

## Rate Limits

Rate limits are enforced per workspace, model, and API key. See the Rate limits section on each endpoint page for the current limits and how they are shared.