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

# Custom llm via dsn

## Overview

You can provide your own LLM configuration data to `Inference` object with DSN string.
This is useful for inline configuration or for building configuration from admin UI,
CLI arguments or environment variables.

## Example

```php theme={null}
<?php
require 'examples/boot.php';

use Cognesy\Config\Dsn;
use Cognesy\Config\Env;
use Cognesy\Messages\Messages;
use Cognesy\Polyglot\Inference\Config\LLMConfig;
use Cognesy\Polyglot\Inference\Inference;
use Cognesy\Utils\Str;

$xaiApiKey = (string) Env::get('XAI_API_KEY', '');
$dsn = "driver=xai,apiUrl=https://api.x.ai/v1,endpoint=/chat/completions,apiKey={$xaiApiKey},model=grok-3";

$answer = Inference::fromConfig(LLMConfig::fromArray(Dsn::fromString($dsn)->toArray()))
    ->with(
        messages: Messages::fromString('What is the capital of France'),
        options: ['max_tokens' => 64]
    )
    ->get();

echo "USER: What is capital of France\n";
echo "ASSISTANT: $answer\n";

assert(Str::contains($answer, 'Paris'));
?>
```