diff --git a/public/js/learningHub.js b/public/js/learningHub.js
index 8b37414..395de81 100644
--- a/public/js/learningHub.js
+++ b/public/js/learningHub.js
@@ -695,11 +695,9 @@
   function populateAiModelSelect() {
     var sel = document.getElementById('lh-ai-model');
     if (!sel || sel.options.length > 1) return;
-    // Copy options from global model select
-    var globalSel = document.getElementById('global-model-select');
-    if (!globalSel) return;
-    sel.innerHTML = globalSel.innerHTML;
-    sel.value = globalSel.value;
+    if (typeof window._buildModelOptions === 'function') {
+      window._buildModelOptions(sel);
+    }
   }
 
   function switchAiTab(tabName) {
@@ -810,7 +808,7 @@
     var slideCount   = document.getElementById('lh-ai-slide-count') ? document.getElementById('lh-ai-slide-count').value : '';
 
     var formData = new FormData();
-    formData.append('model', model);
+    if (model) formData.append('model', model);
     formData.append('questionCount', questionCount);
     formData.append('contentType', contentType);
     if (refinement) formData.append('refinement', refinement);
diff --git a/test/model-defaults.test.js b/test/model-defaults.test.js
index 329ea4f..031fa29 100644
--- a/test/model-defaults.test.js
+++ b/test/model-defaults.test.js
@@ -34,6 +34,13 @@ test('top bar model selector is removed and omitted selections use backend defau
   assert.match(selector, /return undefined/);
 });
 
+test('learning hub model selector uses shared tab model options', () => {
+  const learningHub = read('public/js/learningHub.js');
+  assert.match(learningHub, /window\._buildModelOptions\(sel\)/);
+  assert.doesNotMatch(learningHub, /global-model-select|globalSel\.innerHTML/);
+  assert.match(learningHub, /if \(model\) formData\.append\('model', model\)/);
+});
+
 test('backend AI calls use admin default when request omits model', () => {
   const ai = read('src/utils/ai.js');
   assert.match(ai, /async function resolveModel\(requestedModel\)/);