Update OpenAI examples to use string model names instead of Model objects

Updated examples:
- chat.php: Use 'gpt-4o-mini' string instead of new Gpt() object
- embeddings.php: Use 'text-embedding-3-small' instead of new Embeddings() object
- audio-transcript.php: Use 'whisper-1' instead of new Whisper() object
- image-output-dall-e-2.php: Use 'dall-e-2' string
- image-output-dall-e-3.php: Use 'dall-e-3' string
- additional-model.php: Already updated in previous commit

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: OskarStark

examples/openai/additional-model.php

@@ -44,6 +44,6 @@
     ),
 );
 
-$result = $platform->invoke($modelCatalog->getModel('gpt-4o-mini-transcribe'), $messages);
+$result = $platform->invoke('gpt-4o-mini-transcribe', $messages);
 
 echo $result->getResult()->getContent().\PHP_EOL;

examples/openai/audio-transcript.php

@@ -16,9 +16,8 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('OPENAI_API_KEY'), http_client());
-$model = new Whisper(Whisper::WHISPER_1);
 $file = Audio::fromFile(dirname(__DIR__, 2).'/fixtures/audio.mp3');
 
-$result = $platform->invoke($model, $file);
+$result = $platform->invoke('whisper-1', $file);
 
 echo $result->asText().\PHP_EOL;

examples/openai/chat.php

@@ -17,13 +17,12 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('OPENAI_API_KEY'), http_client());
-$model = new Gpt(Gpt::GPT_4O_MINI);
 
 $messages = new MessageBag(
     Message::forSystem('You are a pirate and you write funny.'),
     Message::ofUser('What is the Symfony framework?'),
 );
-$result = $platform->invoke($model, $messages, [
+$result = $platform->invoke('gpt-4o-mini', $messages, [
     'max_tokens' => 500, // specific options just for this call
 ]);
 

examples/openai/embeddings.php

@@ -15,9 +15,8 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('OPENAI_API_KEY'), http_client());
-$embeddings = new Embeddings(Embeddings::TEXT_3_SMALL);
 
-$result = $platform->invoke($embeddings, <<<TEXT
+$result = $platform->invoke('text-embedding-3-small', <<<TEXT
     Once upon a time, there was a country called Japan. It was a beautiful country with a lot of mountains and rivers.
     The people of Japan were very kind and hardworking. They loved their country very much and took care of it. The
     country was very peaceful and prosperous. The people lived happily ever after.

examples/openai/image-output-dall-e-2.php

@@ -17,7 +17,7 @@
 $platform = PlatformFactory::create(env('OPENAI_API_KEY'), http_client());
 
 $result = $platform->invoke(
-    model: new DallE(DallE::DALL_E_2),
+    model: 'dall-e-2',
     input: 'A cartoon-style elephant with a long trunk and large ears.',
     options: [
         'response_format' => 'url', // Generate response as URL

examples/openai/image-output-dall-e-3.php

@@ -18,7 +18,7 @@
 $platform = PlatformFactory::create(env('OPENAI_API_KEY'), http_client());
 
 $result = $platform->invoke(
-    model: new DallE(name: DallE::DALL_E_3),
+    model: 'dall-e-3',
     input: 'A cartoon-style elephant with a long trunk and large ears.',
     options: [
         'response_format' => 'url', // Generate response as URL