diff --git a/composer.json b/composer.json
index bdc2500..26aa69d 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
     ],
     "require": {
         "php": "^8.2",
-        "papi-ai/papi-core": "^0.14",
+        "papi-ai/papi-core": "^0.15",
         "ext-curl": "*"
     },
     "require-dev": {
diff --git a/src/GroqProvider.php b/src/GroqProvider.php
index 039f963..e00f82e 100644
--- a/src/GroqProvider.php
+++ b/src/GroqProvider.php
@@ -15,6 +15,7 @@
 namespace PapiAI\Groq;
 
 use Generator;
+use PapiAI\Core\Contracts\NamedToolSelectableInterface;
 use PapiAI\Core\Contracts\ProviderInterface;
 use PapiAI\Core\Exception\AuthenticationException;
 use PapiAI\Core\Exception\ProviderException;
@@ -41,14 +42,23 @@
  * - llama-3.1-8b-instant (fast inference)
  * - mixtral-8x7b-32768 (Mixtral)
  *
- * @see https://console.groq.com/docs/api-reference
+ * @see https://console.groq.com/docs/api-reference *
+ * The neutral `effort` option is accepted and ignored here. Groq does expose reasoning_effort on its gpt-oss models, but papi does not map it yet, so the option is accepted and ignored for now. Note it cannot be combined with tool calling or JSON mode. Ignoring it
+ * degrades nothing the caller was promised, which is why it is silent where an unhonourable
+ * `toolChoice` throws.
  */
-class GroqProvider implements ProviderInterface
+class GroqProvider implements ProviderInterface, NamedToolSelectableInterface
 {
     private const API_URL = 'https://api.groq.com/openai/v1/chat/completions';
 
+    public const MODEL_GPT_OSS_120B = 'openai/gpt-oss-120b';
+    public const MODEL_GPT_OSS_20B = 'openai/gpt-oss-20b';
+
+    /** @deprecated Decommissioned 16 August 2026. Use MODEL_GPT_OSS_120B. */
     public const MODEL_LLAMA_3_3_70B = 'llama-3.3-70b-versatile';
+    /** @deprecated Decommissioned 16 August 2026. Use MODEL_GPT_OSS_20B. */
     public const MODEL_LLAMA_3_1_8B = 'llama-3.1-8b-instant';
+    /** @deprecated Decommissioned 20 March 2025; requests fail. */
     public const MODEL_MIXTRAL_8X7B = 'mixtral-8x7b-32768';
 
     /**
@@ -60,7 +70,7 @@ class GroqProvider implements ProviderInterface
      */
     public function __construct(
         private readonly string $apiKey,
-        private readonly string $defaultModel = self::MODEL_LLAMA_3_3_70B,
+        private readonly string $defaultModel = self::MODEL_GPT_OSS_120B,
         private readonly int $defaultMaxTokens = 4096,
     ) {
     }
diff --git a/tests/Unit/GroqProviderTest.php b/tests/Unit/GroqProviderTest.php
index c79dd50..fbeb7d0 100644
--- a/tests/Unit/GroqProviderTest.php
+++ b/tests/Unit/GroqProviderTest.php
@@ -138,7 +138,7 @@ public function callThrowForStatusCode(int $httpCode, ?array $data): never
 
             $this->provider->chat([Message::user('Hello')]);
 
-            expect($this->provider->lastPayload['model'])->toBe('llama-3.3-70b-versatile');
+            expect($this->provider->lastPayload['model'])->toBe('openai/gpt-oss-120b');
         });
 
         it('overrides model and options from parameters', function () {
diff --git a/tests/Unit/GroqToolChoiceTest.php b/tests/Unit/GroqToolChoiceTest.php
index 90506a0..a6f45ce 100644
--- a/tests/Unit/GroqToolChoiceTest.php
+++ b/tests/Unit/GroqToolChoiceTest.php
@@ -12,6 +12,8 @@
 
 declare(strict_types=1);
 
+use PapiAI\Core\Contracts\NamedToolSelectableInterface;
+use PapiAI\Core\Contracts\ToolSelectableInterface;
 use PapiAI\Core\Message;
 use PapiAI\Groq\GroqProvider;
 
@@ -77,3 +79,10 @@ protected function request(array $payload): array
             ->toThrow(InvalidArgumentException::class);
     });
 });
+
+describe('GroqProvider tool-selection capability', function () {
+    it('declares what it can force, so callers can ask instead of catching', function () {
+        expect(is_subclass_of(GroqProvider::class, NamedToolSelectableInterface::class))->toBeTrue();
+        expect(is_subclass_of(GroqProvider::class, ToolSelectableInterface::class))->toBeTrue();
+    });
+});