diff --git a/analyticshub/js/admin.js b/analyticshub/js/admin.js
index 0df1730..a061b66 100644
--- a/analyticshub/js/admin.js
+++ b/analyticshub/js/admin.js
@@ -27,6 +27,7 @@
             google_client_secret: document.getElementById('google_client_secret').value,
             google_refresh_token: document.getElementById('google_refresh_token').value,
             llm_api_endpoint: document.getElementById('llm_api_endpoint').value,
+            llm_model: document.getElementById('llm_model').value,
             anthropic_api_key: document.getElementById('anthropic_api_key').value
         };
 
@@ -96,6 +97,7 @@
                 document.getElementById('google_client_secret').value = '';
                 document.getElementById('google_refresh_token').value = '';
                 document.getElementById('llm_api_endpoint').value = data.data.llm_api_endpoint || '';
+                document.getElementById('llm_model').value = data.data.llm_model || '';
                 document.getElementById('anthropic_api_key').value = '';
                 updateStatus(!!data.data.is_configured);
                 showNotification('Success', 'Configuration loaded');
diff --git a/analyticshub/lib/Controller/AdminController.php b/analyticshub/lib/Controller/AdminController.php
index d182818..6e404a4 100644
--- a/analyticshub/lib/Controller/AdminController.php
+++ b/analyticshub/lib/Controller/AdminController.php
@@ -34,6 +34,7 @@ class AdminController {
         $clientId = $this->config->getAppValue('google_client_id', 'analyticshub', '');
         $apiKey = $this->config->getAppValue('anthropic_api_key', 'analyticshub', '');
         $llmEndpoint = $this->config->getAppValue('llm_api_endpoint', 'analyticshub', '');
+        $llmModel = $this->config->getAppValue('llm_model', 'analyticshub', '');
         $refreshToken = $this->config->getAppValue('google_refresh_token', 'analyticshub', '');
 
         // Check if configured
@@ -56,6 +57,7 @@ class AdminController {
                 'google_client_id' => $clientId,
                 'google_refresh_token' => $maskedRefreshToken,
                 'llm_api_endpoint' => $llmEndpoint,
+                'llm_model' => $llmModel,
                 'anthropic_api_key' => $maskedApiKey,
                 'is_configured' => $isConfigured,
             ],
@@ -80,6 +82,7 @@ class AdminController {
         $refreshToken = $data['google_refresh_token'] ?? '';
         $apiKey = $data['anthropic_api_key'] ?? '';
         $llmEndpoint = $data['llm_api_endpoint'] ?? '';
+        $llmModel = $data['llm_model'] ?? '';
 
         if (empty($clientId) || empty($clientSecret) || empty($apiKey)) {
             return new JSONResponse([
@@ -100,6 +103,10 @@ class AdminController {
             $this->config->setAppValue('llm_api_endpoint', 'analyticshub', $llmEndpoint);
         }
 
+        if (!empty($llmModel)) {
+            $this->config->setAppValue('llm_model', 'analyticshub', $llmModel);
+        }
+
         $this->config->setAppValue('anthropic_api_key', 'analyticshub', $apiKey);
 
         // Check if fully configured
diff --git a/analyticshub/lib/Controller/PageController.php b/analyticshub/lib/Controller/PageController.php
index 8ad0a64..cb820f8 100644
--- a/analyticshub/lib/Controller/PageController.php
+++ b/analyticshub/lib/Controller/PageController.php
@@ -62,6 +62,7 @@ class PageController extends \OCP\AppFramework\Controller {
         $clientId = $this->config->getAppValue('google_client_id', 'analyticshub', '');
         $apiKey = $this->config->getAppValue('anthropic_api_key', 'analyticshub', '');
         $llmEndpoint = $this->config->getAppValue('llm_api_endpoint', 'analyticshub', '');
+        $llmModel = $this->config->getAppValue('llm_model', 'analyticshub', '');
 
         // Mask API key for display
         $maskedApiKey = '';
@@ -78,6 +79,7 @@ class PageController extends \OCP\AppFramework\Controller {
             'is_llm_configured' => $isLLMConfigured,
             'google_client_id' => $clientId,
             'llm_api_endpoint' => $llmEndpoint,
+            'llm_model' => $llmModel,
             'anthropic_api_key_masked' => $maskedApiKey,
             'request' => $this->request,
         ]);
diff --git a/analyticshub/lib/Service/LLMService.php b/analyticshub/lib/Service/LLMService.php
index aeb52b3..4366cb3 100644
--- a/analyticshub/lib/Service/LLMService.php
+++ b/analyticshub/lib/Service/LLMService.php
@@ -45,6 +45,7 @@ class LLMService {
         try {
             $apiKey = $this->config->getAppValue('anthropic_api_key', 'analyticshub');
             $apiEndpoint = $this->config->getAppValue('llm_api_endpoint', 'analyticshub', '');
+            $model = $this->config->getAppValue('llm_model', 'analyticshub', 'claude-sonnet-4-5-20250929');
 
             if (empty($apiKey)) {
                 throw new \Exception('API key not configured');
@@ -58,7 +59,7 @@ class LLMService {
             $userPrompt = $this->buildUserPrompt($processedData);
 
             // Call with retry
-            $response = $this->callWithRetry($systemPrompt, $userPrompt, $apiKey, $endpoint);
+            $response = $this->callWithRetry($systemPrompt, $userPrompt, $apiKey, $endpoint, $model);
 
             return $response;
 
@@ -124,12 +125,12 @@ PROMPT;
     /**
      * Call Claude API with retry logic
      */
-    private function callWithRetry(string $systemPrompt, string $userPrompt, string $apiKey, string $endpoint): string {
+    private function callWithRetry(string $systemPrompt, string $userPrompt, string $apiKey, string $endpoint, string $model): string {
         for ($attempt = 0; $attempt < self::MAX_RETRIES; $attempt++) {
             $this->logger->info("LLM API call attempt {$attempt}/" . self::MAX_RETRIES);
 
             try {
-                $response = $this->makeLLMRequest($systemPrompt, $userPrompt, $apiKey, $endpoint);
+                $response = $this->makeLLMRequest($systemPrompt, $userPrompt, $apiKey, $endpoint, $model);
 
                 // Validate response
                 $this->validateResponse($response);
@@ -186,11 +187,11 @@ PROMPT;
     /**
      * Make HTTP request to LLM API
      */
-    private function makeLLMRequest(string $systemPrompt, string $userPrompt, string $apiKey, string $endpoint): string {
+    private function makeLLMRequest(string $systemPrompt, string $userPrompt, string $apiKey, string $endpoint, string $model): string {
         $ch = curl_init();
 
         $payload = [
-            'model' => 'claude-sonnet-4-5-20250929',
+            'model' => $model,
             'max_tokens' => 2000,
             'system' => $systemPrompt,
             'messages' => [
diff --git a/analyticshub/templates/admin.php b/analyticshub/templates/admin.php
index 399be85..a7977c1 100644
--- a/analyticshub/templates/admin.php
+++ b/analyticshub/templates/admin.php
@@ -98,6 +98,24 @@ style('display:none');
                 </p>
             </div>
 
+            <div class="analytics-hub-settings__field">
+                <label for="llm_model">
+                    <?php p($l->t('Model')); ?>
+                    <span class="analytics-hub-settings__optional"><?php p($l->t('(Optional - defaults to claude-sonnet-4-5-20250929)')); ?></span>
+                </label>
+                <input
+                    type="text"
+                    id="llm_model"
+                    name="llm_model"
+                    value="<?php p($_['llm_model']); ?>"
+                    placeholder="claude-sonnet-4-5-20250929"
+                    autocomplete="off"
+                />
+                <p class="analytics-hub-settings__hint">
+                    <?php p($l->t('Enter the model to use. Examples: claude-sonnet-4-5-20250929, claude-3-5-sonnet-20241022, claude-3-opus-20240229')); ?>
+                </p>
+            </div>
+
             <div class="analytics-hub-settings__field">
                 <label for="anthropic_api_key">
                     <?php p($l->t('API Key')); ?>
diff --git a/oauth-helper.php b/oauth-helper.php
new file mode 100644
index 0000000..877d301
--- /dev/null
+++ b/oauth-helper.php
@@ -0,0 +1,90 @@
+<?php
+/**
+ * OAuth 2.0 Helper for Google Analytics
+ *
+ * Usage:
+ * 1. Get authorization code from OAuth flow (see guide)
+ * 2. Run: php oauth-helper.php YOUR_AUTHORIZATION_CODE
+ * 3. Get refresh_token output
+ * 4. Enter refresh_token into Nextcloud plugin settings
+ */
+
+// Configuration - Update with your values
+$CLIENT_ID = 'YOUR_CLIENT_ID.apps.googleusercontent.com';
+$CLIENT_SECRET = 'GOCSPX-XXXXXXXXXXXXXX'; // From Google Cloud Console
+$REDIRECT_URI = 'https://teamworkapps.com/index.php/apps/analyticshub/';
+
+// Get authorization code from command line
+if ($argc < 2) {
+    echo "Usage: php oauth-helper.php <authorization_code>\n";
+    echo "\n";
+    echo "Get authorization code from:\n";
+    echo "https://accounts.google.com/o/oauth2/v2/auth?\n";
+    echo "  client_id=$CLIENT_ID\n";
+    echo "  &redirect_uri=" . urlencode($REDIRECT_URI) . "\n";
+    echo "  &response_type=code\n";
+    echo "  &scope=" . urlencode('https://www.googleapis.com/auth/analytics.readonly https://www.googleapis.com/auth/analytics') . "\n";
+    echo "\n";
+    echo "After granting permissions, copy the 'code' parameter from the redirect URL.\n";
+    echo "\n";
+    die(1);
+}
+
+$authCode = $argv[1];
+
+// Exchange authorization code for tokens
+$tokenUrl = 'https://oauth2.googleapis.com/token';
+
+$postData = [
+    'code' => $authCode,
+    'client_id' => $CLIENT_ID,
+    'client_secret' => $CLIENT_SECRET,
+    'redirect_uri' => $REDIRECT_URI,
+    'grant_type' => 'authorization_code'
+];
+
+$ch = curl_init();
+curl_setopt($ch, CURLOPT_URL, $tokenUrl);
+curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+curl_setopt($ch, CURLOPT_POST, true);
+curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($postData));
+curl_setopt($ch, CURLOPT_HTTPHEADER, [
+    'Content-Type: application/x-www-form-urlencoded'
+]);
+
+$response = curl_exec($ch);
+$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+
+if (curl_errno($ch)) {
+    echo "Curl error: " . curl_error($ch) . "\n";
+    curl_close($ch);
+    die(1);
+}
+
+curl_close($ch);
+
+if ($httpCode !== 200) {
+    echo "Error: HTTP $httpCode\n";
+    echo "Response: $response\n";
+    die(1);
+}
+
+// Parse JSON response
+$data = json_decode($response, true);
+
+if (!$data || empty($data['refresh_token'])) {
+    echo "Error: No refresh_token in response\n";
+    echo "Response: " . json_encode($data, JSON_PRETTY_PRINT) . "\n";
+    die(1);
+}
+
+// Success!
+echo "✅ Success! Here are your tokens:\n\n";
+echo "ACCESS TOKEN (expires in 1 hour):\n";
+echo $data['access_token'] . "\n\n";
+echo "REFRESH TOKEN (save this in Nextcloud plugin):\n";
+echo $data['refresh_token'] . "\n\n";
+echo "Token type: " . $data['token_type'] . "\n";
+echo "Expires in: " . $data['expires_in'] . " seconds\n";
+echo "\n";
+echo "💡 Now enter the REFRESH TOKEN into the plugin settings!\n";