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

# Providers

> OpenAI and Anthropic provider configuration.

The server has two provider IDs:

* `codex`
* `claude`

Both providers implement the same `ChatProvider` interface: `stream`, `complete`, and
optional `aiModel` access for tool-using agent turns.

## Codex

The `codex` provider uses the OpenAI AI SDK.

| Setting       | Value                                     |
| ------------- | ----------------------------------------- |
| Required key  | `OPENAI_API_KEY`                          |
| Default model | `gpt-5.4`                                 |
| Models        | `gpt-5.4`, `gpt-5.4-mini`, `gpt-5.4-nano` |

## Claude

The `claude` provider uses the Anthropic AI SDK.

| Setting       | Value                                                      |
| ------------- | ---------------------------------------------------------- |
| Required key  | `ANTHROPIC_API_KEY`                                        |
| Default model | `claude-sonnet-4-6`                                        |
| Models        | `claude-sonnet-4-6`, `claude-opus-4-7`, `claude-haiku-4-5` |

## Provider Info

`GET /providers` returns the models and whether each provider is configured:

```json theme={null}
{
  "providers": [
    {
      "id": "codex",
      "label": "Codex",
      "defaultModel": "gpt-5.4",
      "models": ["gpt-5.4", "gpt-5.4-mini", "gpt-5.4-nano"],
      "configured": true
    }
  ]
}
```

## Selection

HTTP requests choose a provider in the request body.

```json theme={null}
{
  "provider": "codex",
  "model": "gpt-5.4-mini",
  "messages": [{ "role": "user", "content": "Explain this file." }]
}
```

WebSocket sessions can choose `provider` and `model` during `session.create`. If omitted,
the server picks the first available provider.