Update additional-model.php to use actual audio input for transcription

- Add Audio content import for audio file handling
- Replace text-based messages with audio input using fixtures/audio.mp3
- Update messages to demonstrate actual transcription use case
- Remove system message and use simple transcription request

Author: OskarStark

examples/openai/additional-model.php

@@ -13,6 +13,7 @@
 use Symfony\AI\Platform\Bridge\OpenAi\ModelCatalog;
 use Symfony\AI\Platform\Bridge\OpenAi\PlatformFactory;
 use Symfony\AI\Platform\Capability;
+use Symfony\AI\Platform\Message\Content\Audio;
 use Symfony\AI\Platform\Message\Message;
 use Symfony\AI\Platform\Message\MessageBag;
 
@@ -40,11 +41,13 @@
 $transcribeModel = $modelCatalog->getModel('gpt-4o-mini-transcribe');
 
 $messages = new MessageBag(
-    Message::forSystem('You are a transcription model specialized in converting audio to text.'),
-    Message::ofUser('Explain what transcription models can do.'),
+    Message::ofUser(
+        'Please transcribe this audio file.',
+        Audio::fromFile(dirname(__DIR__, 2).'/fixtures/audio.mp3'),
+    ),
 );
 
-echo "Using transcription model 'gpt-4o-mini-transcribe':\n";
+echo "Transcribing audio with custom model 'gpt-4o-mini-transcribe':\n";
 $result = $platform->invoke($transcribeModel, $messages, [
     'max_tokens' => 300,
 ]);