diff --git a/examples/anthropic/stream.php b/examples/anthropic/stream.php
index a6a55093b..5046d6e58 100644
--- a/examples/anthropic/stream.php
+++ b/examples/anthropic/stream.php
@@ -17,7 +17,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('ANTHROPIC_API_KEY'), httpClient: http_client());
-$model = new Claude();
+$model = new Claude(Claude::SONNET_37);
 
 $messages = new MessageBag(
     Message::forSystem('You are a thoughtful philosopher.'),
diff --git a/examples/anthropic/toolcall.php b/examples/anthropic/toolcall.php
index 06a37a835..9fee56792 100644
--- a/examples/anthropic/toolcall.php
+++ b/examples/anthropic/toolcall.php
@@ -21,7 +21,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('ANTHROPIC_API_KEY'), httpClient: http_client());
-$model = new Claude();
+$model = new Claude(Claude::SONNET_37);
 
 $wikipedia = new Wikipedia(http_client());
 $toolbox = new Toolbox([$wikipedia], logger: logger());
diff --git a/examples/bedrock/toolcall-nova.php b/examples/bedrock/toolcall-nova.php
index 2b361b9f4..0dbc25a00 100644
--- a/examples/bedrock/toolcall-nova.php
+++ b/examples/bedrock/toolcall-nova.php
@@ -27,7 +27,7 @@
 }
 
 $platform = PlatformFactory::create();
-$model = new Nova();
+$model = new Nova(Nova::PRO);
 
 $wikipedia = new Wikipedia(http_client());
 $toolbox = new Toolbox([$wikipedia]);
diff --git a/examples/elevenlabs/text-to-speech-as-stream.php b/examples/elevenlabs/text-to-speech-as-stream.php
index abe696449..f16b9f5e2 100644
--- a/examples/elevenlabs/text-to-speech-as-stream.php
+++ b/examples/elevenlabs/text-to-speech-as-stream.php
@@ -19,7 +19,7 @@
     apiKey: env('ELEVEN_LABS_API_KEY'),
     httpClient: http_client(),
 );
-$model = new ElevenLabs(options: [
+$model = new ElevenLabs(ElevenLabs::ELEVEN_MULTILINGUAL_V2, [
     'voice' => 'Dslrhjl3ZpzrctukrQSN', // Brad (https://elevenlabs.io/app/voice-library?voiceId=Dslrhjl3ZpzrctukrQSN)
     'stream' => true,
 ]);
diff --git a/examples/elevenlabs/text-to-speech.php b/examples/elevenlabs/text-to-speech.php
index b37c7da6d..8e2a80e73 100644
--- a/examples/elevenlabs/text-to-speech.php
+++ b/examples/elevenlabs/text-to-speech.php
@@ -19,7 +19,7 @@
     apiKey: env('ELEVEN_LABS_API_KEY'),
     httpClient: http_client(),
 );
-$model = new ElevenLabs(options: [
+$model = new ElevenLabs(ElevenLabs::ELEVEN_MULTILINGUAL_V2, [
     'voice' => 'Dslrhjl3ZpzrctukrQSN', // Brad (https://elevenlabs.io/app/voice-library?voiceId=Dslrhjl3ZpzrctukrQSN)
 ]);
 
diff --git a/examples/mistral/chat-multiple.php b/examples/mistral/chat-multiple.php
index 8921b8916..8f361d458 100644
--- a/examples/mistral/chat-multiple.php
+++ b/examples/mistral/chat-multiple.php
@@ -22,7 +22,7 @@
     Message::forSystem('Just give short answers.'),
     Message::ofUser('What is your favorite color?'),
 );
-$result = $platform->invoke(new Mistral(), $messages, [
+$result = $platform->invoke(new Mistral(Mistral::MISTRAL_LARGE), $messages, [
     'temperature' => 1.5,
     'n' => 10,
 ]);
diff --git a/examples/mistral/chat.php b/examples/mistral/chat.php
index 33b08405c..d880efa35 100644
--- a/examples/mistral/chat.php
+++ b/examples/mistral/chat.php
@@ -17,7 +17,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('MISTRAL_API_KEY'), http_client());
-$model = new Mistral();
+$model = new Mistral(Mistral::MISTRAL_LARGE);
 
 $messages = new MessageBag(Message::ofUser('What is the best French cheese?'));
 $result = $platform->invoke($model, $messages, [
diff --git a/examples/mistral/stream.php b/examples/mistral/stream.php
index b6653b10a..a6a5473e8 100644
--- a/examples/mistral/stream.php
+++ b/examples/mistral/stream.php
@@ -17,7 +17,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('MISTRAL_API_KEY'), http_client());
-$model = new Mistral();
+$model = new Mistral(Mistral::MISTRAL_LARGE);
 
 $messages = new MessageBag(Message::ofUser('What is the eighth prime number?'));
 $result = $platform->invoke($model, $messages, [
diff --git a/examples/mistral/token-metadata.php b/examples/mistral/token-metadata.php
index 76bd84af3..1ce8f5c34 100644
--- a/examples/mistral/token-metadata.php
+++ b/examples/mistral/token-metadata.php
@@ -19,7 +19,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('MISTRAL_API_KEY'), http_client());
-$model = new Mistral();
+$model = new Mistral(Mistral::MISTRAL_LARGE);
 
 $agent = new Agent($platform, $model, outputProcessors: [new TokenOutputProcessor()], logger: logger());
 
diff --git a/examples/mistral/toolcall-stream.php b/examples/mistral/toolcall-stream.php
index b13a54ab7..5f7a9e50d 100644
--- a/examples/mistral/toolcall-stream.php
+++ b/examples/mistral/toolcall-stream.php
@@ -21,7 +21,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('MISTRAL_API_KEY'), http_client());
-$model = new Mistral();
+$model = new Mistral(Mistral::MISTRAL_LARGE);
 
 $transcriber = new YouTubeTranscriber(http_client());
 $toolbox = new Toolbox([$transcriber], logger: logger());
diff --git a/examples/mistral/toolcall.php b/examples/mistral/toolcall.php
index 44ee8aea7..b8a9710ba 100644
--- a/examples/mistral/toolcall.php
+++ b/examples/mistral/toolcall.php
@@ -21,7 +21,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('MISTRAL_API_KEY'), http_client());
-$model = new Mistral();
+$model = new Mistral(Mistral::MISTRAL_LARGE);
 
 $toolbox = new Toolbox([new Clock()], logger: logger());
 $processor = new AgentProcessor($toolbox);
diff --git a/examples/perplexity/academic-search.php b/examples/perplexity/academic-search.php
index 8e7149c26..033b53f66 100644
--- a/examples/perplexity/academic-search.php
+++ b/examples/perplexity/academic-search.php
@@ -19,7 +19,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('PERPLEXITY_API_KEY'), http_client());
-$model = new Perplexity();
+$model = new Perplexity(Perplexity::SONAR);
 $agent = new Agent($platform, $model, outputProcessors: [new SearchResultProcessor()], logger: logger());
 
 $messages = new MessageBag(Message::ofUser('What is the best French cheese of the first quarter-century of 21st century?'));
diff --git a/examples/perplexity/chat.php b/examples/perplexity/chat.php
index b52d07382..ce906e4dd 100644
--- a/examples/perplexity/chat.php
+++ b/examples/perplexity/chat.php
@@ -17,7 +17,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('PERPLEXITY_API_KEY'), http_client());
-$model = new Perplexity();
+$model = new Perplexity(Perplexity::SONAR);
 
 $messages = new MessageBag(Message::ofUser('What is the best French cheese?'));
 $response = $platform->invoke($model, $messages);
diff --git a/examples/perplexity/disable-search.php b/examples/perplexity/disable-search.php
index d60874f64..fb003d1a1 100644
--- a/examples/perplexity/disable-search.php
+++ b/examples/perplexity/disable-search.php
@@ -17,7 +17,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('PERPLEXITY_API_KEY'), http_client());
-$model = new Perplexity();
+$model = new Perplexity(Perplexity::SONAR);
 
 $messages = new MessageBag(Message::ofUser('What is 2 + 2?'));
 $response = $platform->invoke($model, $messages, [
diff --git a/examples/perplexity/image-input-url.php b/examples/perplexity/image-input-url.php
index ea8c08432..0bb832242 100644
--- a/examples/perplexity/image-input-url.php
+++ b/examples/perplexity/image-input-url.php
@@ -20,7 +20,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('PERPLEXITY_API_KEY'), http_client());
-$model = new Perplexity();
+$model = new Perplexity(Perplexity::SONAR);
 $agent = new Agent($platform, $model, outputProcessors: [new SearchResultProcessor()], logger: logger());
 
 $messages = new MessageBag(
diff --git a/examples/perplexity/pdf-input-url.php b/examples/perplexity/pdf-input-url.php
index 6454498c0..c3f7434b0 100644
--- a/examples/perplexity/pdf-input-url.php
+++ b/examples/perplexity/pdf-input-url.php
@@ -20,7 +20,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('PERPLEXITY_API_KEY'), http_client());
-$model = new Perplexity();
+$model = new Perplexity(Perplexity::SONAR);
 $agent = new Agent($platform, $model, outputProcessors: [new SearchResultProcessor()], logger: logger());
 
 $messages = new MessageBag(
diff --git a/examples/perplexity/stream.php b/examples/perplexity/stream.php
index 5f2bb526a..8311ae583 100644
--- a/examples/perplexity/stream.php
+++ b/examples/perplexity/stream.php
@@ -19,7 +19,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('PERPLEXITY_API_KEY'), http_client());
-$model = new Perplexity();
+$model = new Perplexity(Perplexity::SONAR);
 $agent = new Agent($platform, $model, outputProcessors: [new SearchResultProcessor()], logger: logger());
 
 $messages = new MessageBag(
diff --git a/examples/perplexity/token-metadata.php b/examples/perplexity/token-metadata.php
index 3f32e2597..400b03216 100644
--- a/examples/perplexity/token-metadata.php
+++ b/examples/perplexity/token-metadata.php
@@ -19,7 +19,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('PERPLEXITY_API_KEY'), http_client());
-$model = new Perplexity();
+$model = new Perplexity(Perplexity::SONAR);
 $agent = new Agent($platform, $model, outputProcessors: [new TokenOutputProcessor()], logger: logger());
 
 $messages = new MessageBag(
diff --git a/examples/perplexity/web-search.php b/examples/perplexity/web-search.php
index 42a85126d..92ca9a2f8 100644
--- a/examples/perplexity/web-search.php
+++ b/examples/perplexity/web-search.php
@@ -17,7 +17,7 @@
 require_once dirname(__DIR__).'/bootstrap.php';
 
 $platform = PlatformFactory::create(env('PERPLEXITY_API_KEY'), http_client());
-$model = new Perplexity();
+$model = new Perplexity(Perplexity::SONAR);
 
 $messages = new MessageBag(Message::ofUser('What is the best French cheese?'));
 $response = $platform->invoke($model, $messages, [
diff --git a/src/agent/tests/InputProcessor/ModelOverrideInputProcessorTest.php b/src/agent/tests/InputProcessor/ModelOverrideInputProcessorTest.php
index bfa1f42f9..1ce0abd45 100644
--- a/src/agent/tests/InputProcessor/ModelOverrideInputProcessorTest.php
+++ b/src/agent/tests/InputProcessor/ModelOverrideInputProcessorTest.php
@@ -35,8 +35,8 @@ final class ModelOverrideInputProcessorTest extends TestCase
 {
     public function testProcessInputWithValidModelOption()
     {
-        $gpt = new Gpt();
-        $claude = new Claude();
+        $gpt = new Gpt(Gpt::GPT_4O);
+        $claude = new Claude(Claude::SONNET_37);
         $input = new Input($gpt, new MessageBag(), ['model' => $claude]);
 
         $processor = new ModelOverrideInputProcessor();
@@ -47,7 +47,7 @@ public function testProcessInputWithValidModelOption()
 
     public function testProcessInputWithoutModelOption()
     {
-        $gpt = new Gpt();
+        $gpt = new Gpt(Gpt::GPT_4O);
         $input = new Input($gpt, new MessageBag());
 
         $processor = new ModelOverrideInputProcessor();
@@ -61,7 +61,7 @@ public function testProcessInputWithInvalidModelOption()
         $this->expectException(InvalidArgumentException::class);
         $this->expectExceptionMessage('Option "model" must be an instance of "'.Model::class.'".');
 
-        $gpt = new Gpt();
+        $gpt = new Gpt(Gpt::GPT_4O);
         $model = new MessageBag();
         $input = new Input($gpt, new MessageBag(), ['model' => $model]);
 
diff --git a/src/agent/tests/InputProcessor/SystemPromptInputProcessorTest.php b/src/agent/tests/InputProcessor/SystemPromptInputProcessorTest.php
index e0177ff4d..84325c047 100644
--- a/src/agent/tests/InputProcessor/SystemPromptInputProcessorTest.php
+++ b/src/agent/tests/InputProcessor/SystemPromptInputProcessorTest.php
@@ -48,7 +48,7 @@ public function testProcessInputAddsSystemMessageWhenNoneExists()
     {
         $processor = new SystemPromptInputProcessor('This is a system prompt');
 
-        $input = new Input(new Gpt(), new MessageBag(Message::ofUser('This is a user message')));
+        $input = new Input(new Gpt(Gpt::GPT_4O), new MessageBag(Message::ofUser('This is a user message')));
         $processor->processInput($input);
 
         $messages = $input->messages->getMessages();
@@ -66,7 +66,7 @@ public function testProcessInputDoesNotAddSystemMessageWhenOneExists()
             Message::forSystem('This is already a system prompt'),
             Message::ofUser('This is a user message'),
         );
-        $input = new Input(new Gpt(), $messages);
+        $input = new Input(new Gpt(Gpt::GPT_4O), $messages);
         $processor->processInput($input);
 
         $messages = $input->messages->getMessages();
@@ -93,7 +93,7 @@ public function execute(ToolCall $toolCall): mixed
             },
         );
 
-        $input = new Input(new Gpt(), new MessageBag(Message::ofUser('This is a user message')));
+        $input = new Input(new Gpt(Gpt::GPT_4O), new MessageBag(Message::ofUser('This is a user message')));
         $processor->processInput($input);
 
         $messages = $input->messages->getMessages();
@@ -133,7 +133,7 @@ public function execute(ToolCall $toolCall): mixed
             true,
         );
 
-        $input = new Input(new Gpt(), new MessageBag(Message::ofUser('This is a user message')));
+        $input = new Input(new Gpt(Gpt::GPT_4O), new MessageBag(Message::ofUser('This is a user message')));
         $processor->processInput($input);
 
         $messages = $input->messages->getMessages();
@@ -175,7 +175,7 @@ public function execute(ToolCall $toolCall): mixed
             },
         );
 
-        $input = new Input(new Gpt(), new MessageBag(Message::ofUser('This is a user message')));
+        $input = new Input(new Gpt(Gpt::GPT_4O), new MessageBag(Message::ofUser('This is a user message')));
         $processor->processInput($input);
 
         $messages = $input->messages->getMessages();
@@ -198,7 +198,7 @@ public function testWithTranslatedSystemPrompt()
     {
         $processor = new SystemPromptInputProcessor('This is a', null, $this->getTranslator(), true);
 
-        $input = new Input(new Gpt(), new MessageBag(Message::ofUser('This is a user message')), []);
+        $input = new Input(new Gpt(Gpt::GPT_4O), new MessageBag(Message::ofUser('This is a user message')), []);
         $processor->processInput($input);
 
         $messages = $input->messages->getMessages();
@@ -218,7 +218,7 @@ public function testWithTranslationDomainSystemPrompt()
             'prompts'
         );
 
-        $input = new Input(new Gpt(), new MessageBag(), []);
+        $input = new Input(new Gpt(Gpt::GPT_4O), new MessageBag(), []);
         $processor->processInput($input);
 
         $messages = $input->messages->getMessages();
diff --git a/src/platform/src/Bridge/Anthropic/Claude.php b/src/platform/src/Bridge/Anthropic/Claude.php
index e1bec6e4f..a208773a5 100644
--- a/src/platform/src/Bridge/Anthropic/Claude.php
+++ b/src/platform/src/Bridge/Anthropic/Claude.php
@@ -35,7 +35,7 @@ class Claude extends Model
      * @param array<string, mixed> $options The default options for the model usage
      */
     public function __construct(
-        string $name = self::SONNET_37,
+        string $name,
         array $options = ['max_tokens' => 1000],
     ) {
         $capabilities = [
diff --git a/src/platform/src/Bridge/Bedrock/Nova/Nova.php b/src/platform/src/Bridge/Bedrock/Nova/Nova.php
index 0064d142b..2839fd4c7 100644
--- a/src/platform/src/Bridge/Bedrock/Nova/Nova.php
+++ b/src/platform/src/Bridge/Bedrock/Nova/Nova.php
@@ -28,7 +28,7 @@ final class Nova extends Model
      * @param array<string, mixed> $options The default options for the model usage
      */
     public function __construct(
-        string $name = self::PRO,
+        string $name,
         array $options = ['max_tokens' => 1000],
     ) {
         $capabilities = [
diff --git a/src/platform/src/Bridge/ElevenLabs/ElevenLabs.php b/src/platform/src/Bridge/ElevenLabs/ElevenLabs.php
index 63ba580d1..476f1d9f4 100644
--- a/src/platform/src/Bridge/ElevenLabs/ElevenLabs.php
+++ b/src/platform/src/Bridge/ElevenLabs/ElevenLabs.php
@@ -32,7 +32,7 @@ final class ElevenLabs extends Model
     public const SCRIBE_V1_EXPERIMENTAL = 'scribe_v1_experimental';
 
     public function __construct(
-        string $name = self::ELEVEN_MULTILINGUAL_V2,
+        string $name,
         array $options = [],
     ) {
         parent::__construct($name, [], $options);
diff --git a/src/platform/src/Bridge/Mistral/Embeddings.php b/src/platform/src/Bridge/Mistral/Embeddings.php
index 6f96f5f48..e9321027d 100644
--- a/src/platform/src/Bridge/Mistral/Embeddings.php
+++ b/src/platform/src/Bridge/Mistral/Embeddings.php
@@ -25,7 +25,7 @@ final class Embeddings extends Model
      * @param array<string, mixed> $options
      */
     public function __construct(
-        string $name = self::MISTRAL_EMBED,
+        string $name,
         array $options = [],
     ) {
         parent::__construct($name, [Capability::INPUT_MULTIPLE], $options);
diff --git a/src/platform/src/Bridge/Mistral/Mistral.php b/src/platform/src/Bridge/Mistral/Mistral.php
index 44e8e03fd..9d2a4533a 100644
--- a/src/platform/src/Bridge/Mistral/Mistral.php
+++ b/src/platform/src/Bridge/Mistral/Mistral.php
@@ -36,7 +36,7 @@ final class Mistral extends Model
      * @param array<string, mixed> $options
      */
     public function __construct(
-        string $name = self::MISTRAL_LARGE,
+        string $name,
         array $options = [],
     ) {
         $capabilities = [
diff --git a/src/platform/src/Bridge/OpenAi/Gpt.php b/src/platform/src/Bridge/OpenAi/Gpt.php
index 286456f5f..a60d4b580 100644
--- a/src/platform/src/Bridge/OpenAi/Gpt.php
+++ b/src/platform/src/Bridge/OpenAi/Gpt.php
@@ -74,7 +74,7 @@ class Gpt extends Model
      * @param array<mixed> $options The default options for the model usage
      */
     public function __construct(
-        string $name = self::GPT_4O,
+        string $name,
         array $options = [],
     ) {
         $capabilities = [
diff --git a/src/platform/src/Bridge/Perplexity/Perplexity.php b/src/platform/src/Bridge/Perplexity/Perplexity.php
index 93a7a20d5..8a8ae700c 100644
--- a/src/platform/src/Bridge/Perplexity/Perplexity.php
+++ b/src/platform/src/Bridge/Perplexity/Perplexity.php
@@ -29,7 +29,7 @@ final class Perplexity extends Model
      * @param array<string, mixed> $options
      */
     public function __construct(
-        string $name = self::SONAR,
+        string $name,
         array $options = [],
     ) {
         $capabilities = [
diff --git a/src/platform/tests/Bridge/Anthropic/Contract/AssistantMessageNormalizerTest.php b/src/platform/tests/Bridge/Anthropic/Contract/AssistantMessageNormalizerTest.php
index 72ba32b29..81c00c0a5 100644
--- a/src/platform/tests/Bridge/Anthropic/Contract/AssistantMessageNormalizerTest.php
+++ b/src/platform/tests/Bridge/Anthropic/Contract/AssistantMessageNormalizerTest.php
@@ -36,7 +36,7 @@ public function testSupportsNormalization()
         $normalizer = new AssistantMessageNormalizer();
 
         $this->assertTrue($normalizer->supportsNormalization(new AssistantMessage('Hello'), context: [
-            Contract::CONTEXT_MODEL => new Claude(),
+            Contract::CONTEXT_MODEL => new Claude(Claude::SONNET_37),
         ]));
         $this->assertFalse($normalizer->supportsNormalization('not an assistant message'));
     }
diff --git a/src/platform/tests/Bridge/Anthropic/ModelClientTest.php b/src/platform/tests/Bridge/Anthropic/ModelClientTest.php
index 16a527fc2..d9e978991 100644
--- a/src/platform/tests/Bridge/Anthropic/ModelClientTest.php
+++ b/src/platform/tests/Bridge/Anthropic/ModelClientTest.php
@@ -27,7 +27,7 @@ class ModelClientTest extends TestCase
 
     protected function setUp(): void
     {
-        $this->model = new Claude();
+        $this->model = new Claude(Claude::SONNET_37);
     }
 
     public function testAnthropicBetaHeaderIsSetWithSingleBetaFeature()
diff --git a/src/platform/tests/Bridge/Bedrock/Nova/ContractTest.php b/src/platform/tests/Bridge/Bedrock/Nova/ContractTest.php
index b04583e6d..91fcb59fd 100644
--- a/src/platform/tests/Bridge/Bedrock/Nova/ContractTest.php
+++ b/src/platform/tests/Bridge/Bedrock/Nova/ContractTest.php
@@ -55,7 +55,7 @@ public function testConvert(MessageBag $bag, array $expected)
             new UserMessageNormalizer(),
         );
 
-        $this->assertEquals($expected, $contract->createRequestPayload(new Nova(), $bag));
+        $this->assertEquals($expected, $contract->createRequestPayload(new Nova(Nova::PRO), $bag));
     }
 
     /**
diff --git a/src/platform/tests/Bridge/ElevenLabs/Contract/ElevenLabsContractTest.php b/src/platform/tests/Bridge/ElevenLabs/Contract/ElevenLabsContractTest.php
index a50d0eeb7..baaddc3f3 100644
--- a/src/platform/tests/Bridge/ElevenLabs/Contract/ElevenLabsContractTest.php
+++ b/src/platform/tests/Bridge/ElevenLabs/Contract/ElevenLabsContractTest.php
@@ -29,7 +29,7 @@ public function testItCanCreatePayloadWithAudio()
 
         $contract = ElevenLabsContract::create();
 
-        $payload = $contract->createRequestPayload(new ElevenLabs(), $audio);
+        $payload = $contract->createRequestPayload(new ElevenLabs(ElevenLabs::ELEVEN_MULTILINGUAL_V2), $audio);
 
         $this->assertSame([
             'type' => 'input_audio',
diff --git a/src/platform/tests/Bridge/ElevenLabs/ElevenLabsClientTest.php b/src/platform/tests/Bridge/ElevenLabs/ElevenLabsClientTest.php
index 9656e4eee..2d5dad788 100644
--- a/src/platform/tests/Bridge/ElevenLabs/ElevenLabsClientTest.php
+++ b/src/platform/tests/Bridge/ElevenLabs/ElevenLabsClientTest.php
@@ -41,7 +41,7 @@ public function testSupportsModel()
             'https://api.elevenlabs.io/v1',
         );
 
-        $this->assertTrue($client->supports(new ElevenLabs()));
+        $this->assertTrue($client->supports(new ElevenLabs(ElevenLabs::ELEVEN_MULTILINGUAL_V2)));
         $this->assertFalse($client->supports(new Model('any-model')));
     }
 
@@ -129,7 +129,7 @@ public function testClientCannotPerformTextToSpeechRequestWithoutValidPayload()
         $this->expectException(InvalidArgumentException::class);
         $this->expectExceptionMessage('The payload must contain a "text" key');
         $this->expectExceptionCode(0);
-        $client->request(new ElevenLabs(options: [
+        $client->request(new ElevenLabs(ElevenLabs::ELEVEN_MULTILINGUAL_V2, [
             'voice' => 'Dslrhjl3ZpzrctukrQSN',
         ]), []);
     }
@@ -154,7 +154,7 @@ public function testClientCanPerformTextToSpeechRequest()
             'my-api-key',
         );
 
-        $client->request(new ElevenLabs(options: [
+        $client->request(new ElevenLabs(ElevenLabs::ELEVEN_MULTILINGUAL_V2, [
             'voice' => 'Dslrhjl3ZpzrctukrQSN',
         ]), [
             'text' => 'foo',
@@ -183,7 +183,7 @@ public function testClientCanPerformTextToSpeechRequestAsStream()
             'my-api-key',
         );
 
-        $result = $client->request(new ElevenLabs(options: [
+        $result = $client->request(new ElevenLabs(ElevenLabs::ELEVEN_MULTILINGUAL_V2, [
             'voice' => 'Dslrhjl3ZpzrctukrQSN',
             'stream' => true,
         ]), [
diff --git a/src/platform/tests/Bridge/ElevenLabs/ElevenLabsConverterTest.php b/src/platform/tests/Bridge/ElevenLabs/ElevenLabsConverterTest.php
index df09588c6..f7232254d 100644
--- a/src/platform/tests/Bridge/ElevenLabs/ElevenLabsConverterTest.php
+++ b/src/platform/tests/Bridge/ElevenLabs/ElevenLabsConverterTest.php
@@ -34,7 +34,7 @@ public function testSupportsModel()
     {
         $converter = new ElevenLabsResultConverter(new MockHttpClient());
 
-        $this->assertTrue($converter->supports(new ElevenLabs()));
+        $this->assertTrue($converter->supports(new ElevenLabs(ElevenLabs::ELEVEN_MULTILINGUAL_V2)));
         $this->assertFalse($converter->supports(new Model('any-model')));
     }
 
diff --git a/src/platform/tests/Bridge/Mistral/Contract/DocumentNormalizerTest.php b/src/platform/tests/Bridge/Mistral/Contract/DocumentNormalizerTest.php
index 8306f526b..0f2f58644 100644
--- a/src/platform/tests/Bridge/Mistral/Contract/DocumentNormalizerTest.php
+++ b/src/platform/tests/Bridge/Mistral/Contract/DocumentNormalizerTest.php
@@ -29,7 +29,7 @@ public function testSupportsNormalization()
         $normalizer = new DocumentNormalizer();
 
         $this->assertTrue($normalizer->supportsNormalization(new Document('some content', 'application/pdf'), context: [
-            Contract::CONTEXT_MODEL => new Mistral(),
+            Contract::CONTEXT_MODEL => new Mistral(Mistral::MISTRAL_LARGE),
         ]));
         $this->assertFalse($normalizer->supportsNormalization('not a document'));
     }
diff --git a/src/platform/tests/Bridge/Mistral/Contract/DocumentUrlNormalizerTest.php b/src/platform/tests/Bridge/Mistral/Contract/DocumentUrlNormalizerTest.php
index e5ecb3daf..7fe911fec 100644
--- a/src/platform/tests/Bridge/Mistral/Contract/DocumentUrlNormalizerTest.php
+++ b/src/platform/tests/Bridge/Mistral/Contract/DocumentUrlNormalizerTest.php
@@ -29,7 +29,7 @@ public function testSupportsNormalization()
         $normalizer = new DocumentUrlNormalizer();
 
         $this->assertTrue($normalizer->supportsNormalization(new DocumentUrl('https://example.com/document.pdf'), context: [
-            Contract::CONTEXT_MODEL => new Mistral(),
+            Contract::CONTEXT_MODEL => new Mistral(Mistral::MISTRAL_LARGE),
         ]));
         $this->assertFalse($normalizer->supportsNormalization('not a document url'));
     }
diff --git a/src/platform/tests/Bridge/Perplexity/Contract/FileUrlNormalizerTest.php b/src/platform/tests/Bridge/Perplexity/Contract/FileUrlNormalizerTest.php
index 7dafe4a2c..62d6390d8 100644
--- a/src/platform/tests/Bridge/Perplexity/Contract/FileUrlNormalizerTest.php
+++ b/src/platform/tests/Bridge/Perplexity/Contract/FileUrlNormalizerTest.php
@@ -31,7 +31,7 @@ public function testSupportsNormalization()
         $normalizer = new FileUrlNormalizer();
 
         $this->assertTrue($normalizer->supportsNormalization(new DocumentUrl(\dirname(__DIR__, 6).'/fixtures/not-a-document.pdf'), context: [
-            Contract::CONTEXT_MODEL => new Perplexity(),
+            Contract::CONTEXT_MODEL => new Perplexity(Perplexity::SONAR),
         ]));
         $this->assertFalse($normalizer->supportsNormalization('not a document'));
     }
diff --git a/src/platform/tests/Bridge/Perplexity/ModelClientTest.php b/src/platform/tests/Bridge/Perplexity/ModelClientTest.php
index b04a5af3e..c9bcc5b6a 100644
--- a/src/platform/tests/Bridge/Perplexity/ModelClientTest.php
+++ b/src/platform/tests/Bridge/Perplexity/ModelClientTest.php
@@ -81,7 +81,7 @@ public function testItIsSupportingTheCorrectModel()
     {
         $modelClient = new ModelClient(new MockHttpClient(), 'pplx-api-key');
 
-        $this->assertTrue($modelClient->supports(new Perplexity()));
+        $this->assertTrue($modelClient->supports(new Perplexity(Perplexity::SONAR)));
     }
 
     public function testItIsExecutingTheCorrectRequest()
@@ -96,7 +96,7 @@ public function testItIsExecutingTheCorrectRequest()
         };
         $httpClient = new MockHttpClient([$resultCallback]);
         $modelClient = new ModelClient($httpClient, 'pplx-api-key');
-        $modelClient->request(new Perplexity(), ['model' => 'sonar', 'messages' => [['role' => 'user', 'content' => 'test message']]]);
+        $modelClient->request(new Perplexity(Perplexity::SONAR), ['model' => 'sonar', 'messages' => [['role' => 'user', 'content' => 'test message']]]);
     }
 
     public function testItIsExecutingTheCorrectRequestWithArrayPayload()
@@ -111,6 +111,6 @@ public function testItIsExecutingTheCorrectRequestWithArrayPayload()
         };
         $httpClient = new MockHttpClient([$resultCallback]);
         $modelClient = new ModelClient($httpClient, 'pplx-api-key');
-        $modelClient->request(new Perplexity(), ['model' => 'sonar', 'messages' => [['role' => 'user', 'content' => 'Hello']]]);
+        $modelClient->request(new Perplexity(Perplexity::SONAR), ['model' => 'sonar', 'messages' => [['role' => 'user', 'content' => 'Hello']]]);
     }
 }
diff --git a/src/platform/tests/Bridge/Perplexity/PerplexityTest.php b/src/platform/tests/Bridge/Perplexity/PerplexityTest.php
index 31b7aa3f2..176a476d2 100644
--- a/src/platform/tests/Bridge/Perplexity/PerplexityTest.php
+++ b/src/platform/tests/Bridge/Perplexity/PerplexityTest.php
@@ -25,7 +25,7 @@ final class PerplexityTest extends TestCase
 {
     public function testItCreatesPerplexityWithDefaultSettings()
     {
-        $perplexity = new Perplexity();
+        $perplexity = new Perplexity(Perplexity::SONAR);
 
         $this->assertSame(Perplexity::SONAR, $perplexity->getName());
         $this->assertSame([], $perplexity->getOptions());