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

# Answer reference

> Options, parameters, and specifications for Seltz Answer

This topic provides reference information for the `/answer` endpoint.

## Request Parameters

See the [Answer API Reference](/api-reference/answer) for the full list of request parameters, their types, and whether they're required. For how the `model` tiers and `response_format` behave, see [Answer concepts](/answer/answer-concepts).

## Error Responses

Answer endpoint errors return appropriate HTTP status codes:

```json theme={null}
{
  "error": {
    "type": "authentication_error",
    "message": "Invalid API key provided."
  }
}
```

| Status | Error Type             | Description                 |
| ------ | ---------------------- | --------------------------- |
| 400    | `validation_error`     | Invalid request parameters. |
| 401    | `authentication_error` | Invalid or missing API key. |
| 404    | —                      | Endpoint not found.         |
| 429    | `rate_limit_error`     | Too many requests.          |
| 500    | `server_error`         | Internal server error.      |