diff --git a/backend/public/test_models.php b/backend/public/test_models.php
new file mode 100644
index 0000000..ec17d39
--- /dev/null
+++ b/backend/public/test_models.php
@@ -0,0 +1,64 @@
+<?php
+// Secure token check to prevent unauthorized execution
+if (($_GET['token'] ?? '') !== 'nabeh_test_audio_1298') {
+    http_response_code(403);
+    die('Unauthorized access');
+}
+
+require_once dirname(__DIR__) . '/app/bootstrap.php';
+
+use App\Core\Database;
+
+header('Content-Type: text/plain; charset=utf-8');
+
+echo "=== Gemini Available Models Diagnostics ===\n\n";
+
+$rules = Database::select("SELECT * FROM chatbot_rules WHERE trigger_type = 'gemini_ai' AND is_active = 1 LIMIT 1");
+if (empty($rules)) {
+    echo "❌ [Database] No active chatbot rule found.\n";
+    exit(1);
+}
+
+$rule = $rules[0];
+$apiKey = $rule['gemini_api_key'] ?: getenv('GEMINI_API_KEY');
+
+if (empty($apiKey)) {
+    echo "❌ [Config] Gemini API Key is empty.\n";
+    exit(1);
+}
+
+$url = 'https://generativelanguage.googleapis.com/v1beta/models?key=' . $apiKey;
+
+$ch = curl_init($url);
+curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+curl_setopt($ch, CURLOPT_TIMEOUT, 30);
+$response = curl_exec($ch);
+$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+curl_close($ch);
+
+if ($httpCode !== 200) {
+    echo "❌ [Gemini API Error] HTTP Status: " . $httpCode . "\n";
+    echo "Response: " . $response . "\n";
+    exit(1);
+}
+
+$data = json_decode($response, true);
+if (empty($data['models'])) {
+    echo "❌ [Gemini] No models returned or invalid response structure.\n";
+    echo "Response: " . print_r($data, true) . "\n";
+    exit(1);
+}
+
+echo "Found " . count($data['models']) . " models:\n\n";
+foreach ($data['models'] as $model) {
+    echo "Model Name: " . $model['name'] . "\n";
+    echo "Display Name: " . $model['displayName'] . "\n";
+    echo "Supported Methods: " . implode(', ', $model['supportedGenerationMethods'] ?? []) . "\n";
+    if (isset($model['inputTokenLimit'])) {
+        echo "Input Token Limit: " . $model['inputTokenLimit'] . "\n";
+    }
+    if (isset($model['outputTokenLimit'])) {
+        echo "Output Token Limit: " . $model['outputTokenLimit'] . "\n";
+    }
+    echo "----------------------------------------\n";
+}