diff --git a/static/index.html b/static/index.html
index 11fd3c22..6f8adf94 100644
--- a/static/index.html
+++ b/static/index.html
@@ -89,6 +89,10 @@
                             <i class="fas fa-brain"></i>
                             <span>Models</span>
                         </li>
+                        <li class="menu-item" data-page="model-groups">
+                            <i class="fas fa-code-branch"></i>
+                            <span>Model Groups</span>
+                        </li>
                     </ul>
                 </div>
 
@@ -164,7 +168,7 @@
     <script src="/js/auth.js?v=7"></script>
     <script src="/js/charts.js?v=7"></script>
     <script src="/js/websocket.js?v=7"></script>
-    <script src="/js/dashboard.js?v=7"></script>
+    <script src="/js/dashboard.js?v=8"></script>
     
     <!-- Page Modules -->
     <script src="/js/pages/overview.js?v=7"></script>
@@ -177,5 +181,6 @@
     <script src="/js/pages/settings.js?v=7"></script>
     <script src="/js/pages/logs.js?v=7"></script>
     <script src="/js/pages/users.js?v=7"></script>
+    <script src="/js/pages/model_groups.js?v=8"></script>
 </body>
 </html>
diff --git a/static/js/dashboard.js b/static/js/dashboard.js
index 53a84b24..7420b681 100644
--- a/static/js/dashboard.js
+++ b/static/js/dashboard.js
@@ -119,6 +119,7 @@ class Dashboard {
             'settings': 'Settings',
             'logs': 'Logs',
             'models': 'Models',
+            'model-groups': 'Model Groups',
             'users': 'User Management'
         };
         if (titleElement) titleElement.textContent = titles[page] || 'Dashboard';
@@ -130,6 +131,11 @@ class Dashboard {
             if (content) {
                 content.innerHTML = await this.getPageTemplate(page);
                 await this.initializePageScript(page);
+
+                // Model Groups page uses its own render method
+                if (page === 'model-groups' && typeof modelGroupsPage !== 'undefined') {
+                    await modelGroupsPage.render();
+                }
             }
         } catch (error) {
             console.error(`Error loading page ${page}:`, error);
diff --git a/static/js/pages/model_groups.js b/static/js/pages/model_groups.js
new file mode 100644
index 00000000..d8502986
--- /dev/null
+++ b/static/js/pages/model_groups.js
@@ -0,0 +1,168 @@
+// Model Groups Management Page
+
+class ModelGroupsPage {
+    constructor() {
+        this.container = document.getElementById('page-content');
+    }
+
+    async render() {
+        this.container.innerHTML = `
+            <div class="page-header">
+                <h3>Model Groups</h3>
+                <p class="text-muted">Define auto-routing groups that pick the best model for each request.</p>
+                <button class="btn btn-primary" onclick="modelGroupsPage.showCreateForm()">
+                    <i class="fas fa-plus"></i> Add Group
+                </button>
+            </div>
+            <div id="model-groups-list" class="table-container"></div>
+            <div id="model-group-form" class="form-container" style="display:none;"></div>
+        `;
+        await this.loadGroups();
+    }
+
+    async loadGroups() {
+        try {
+            const groups = await api.get('/api/model-groups');
+            const list = document.getElementById('model-groups-list');
+            if (!groups || groups.length === 0) {
+                list.innerHTML = '<div class="empty-state">No model groups defined. Create one to enable auto-routing.</div>';
+                return;
+            }
+
+            let html = '<table class="data-table"><thead><tr>';
+            html += '<th>Group ID</th><th>Strategy</th><th>Targets</th><th>Actions</th>';
+            html += '</tr></thead><tbody>';
+
+            groups.forEach(g => {
+                html += '<tr>';
+                html += '<td><code>' + this.esc(g.id) + '</code></td>';
+                html += '<td><span class="badge">' + this.esc(g.strategy) + '</span></td>';
+                html += '<td><code>' + this.esc(g.targets) + '</code></td>';
+                html += '<td>';
+                html += '<button class="btn btn-sm" onclick="modelGroupsPage.showEditForm(\'' + this.esc(g.id) + '\')">Edit</button> ';
+                html += '<button class="btn btn-sm btn-danger" onclick="modelGroupsPage.deleteGroup(\'' + this.esc(g.id) + '\')">Delete</button>';
+                html += '</td></tr>';
+            });
+
+            html += '</tbody></table>';
+            list.innerHTML = html;
+        } catch (err) {
+            document.getElementById('model-groups-list').innerHTML =
+                '<div class="error-message">Failed to load model groups: ' + this.esc(err.message) + '</div>';
+        }
+    }
+
+    showCreateForm() {
+        this.renderForm(null);
+    }
+
+    async showEditForm(id) {
+        try {
+            const groups = await api.get('/api/model-groups');
+            const group = groups.find(g => g.id === id);
+            if (group) this.renderForm(group);
+        } catch (err) {
+            alert('Failed to load group: ' + err.message);
+        }
+    }
+
+    renderForm(group) {
+        const isEdit = !!group;
+        const form = document.getElementById('model-group-form');
+        form.style.display = 'block';
+        form.innerHTML = `
+            <h4>${isEdit ? 'Edit' : 'Create'} Model Group</h4>
+            <form onsubmit="modelGroupsPage.saveGroup(event, ${isEdit})">
+                <div class="form-control">
+                    <label>Group ID</label>
+                    <input type="text" id="mg-id" value="${this.esc(group ? group.id : '')}" ${isEdit ? 'readonly' : 'required'}
+                        placeholder="e.g. deepseek-auto">
+                    <small>Clients use this as the model name.</small>
+                </div>
+                <div class="form-control">
+                    <label>Strategy</label>
+                    <select id="mg-strategy">
+                        <option value="heuristic" ${group && group.strategy === 'heuristic' ? 'selected' : ''}>Heuristic (rules-based)</option>
+                        <option value="classifier" ${group && group.strategy === 'classifier' ? 'selected' : ''}>Classifier (LLM judge)</option>
+                    </select>
+                </div>
+                <div class="form-control">
+                    <label>Targets (JSON array)</label>
+                    <input type="text" id="mg-targets" value='${this.esc(group ? group.targets : '["cheap-model","smart-model"]')}' required>
+                    <small>First target = cheapest/fastest. Last target = smartest/most expensive.</small>
+                </div>
+                <div class="form-control" id="mg-selector-row" style="${group && group.strategy === 'classifier' ? '' : 'display:none'}">
+                    <label>Selector Model</label>
+                    <input type="text" id="mg-selector-model" value="${this.esc(group && group.selector_model ? group.selector_model : 'gpt-4o-mini')}"
+                        placeholder="Model used to judge task complexity">
+                </div>
+                <div class="form-control" id="mg-threshold-row" style="${group && group.strategy === 'classifier' ? '' : 'display:none'}">
+                    <label>Complexity Threshold</label>
+                    <input type="number" id="mg-threshold" value="${group && group.complexity_threshold ? group.complexity_threshold : ''}" min="1"
+                        placeholder="Tasks rated >= this go to the smart model">
+                </div>
+                <div class="form-control" id="mg-rules-row" style="${group && group.strategy === 'heuristic' ? '' : 'display:none'}">
+                    <label>Heuristic Rules (JSON array)</label>
+                    <textarea id="mg-rules" rows="4" placeholder='[{"pattern":"step by step","target":1}]'>${group && group.heuristic_rules ? group.heuristic_rules : ''}</textarea>
+                    <small>Pattern to match in user messages. target = index into targets array.</small>
+                </div>
+                <div class="form-actions">
+                    <button type="submit" class="btn btn-primary">Save</button>
+                    <button type="button" class="btn" onclick="document.getElementById('model-group-form').style.display='none'">Cancel</button>
+                </div>
+            </form>
+        `;
+
+        document.getElementById('mg-strategy').onchange = function() {
+            var isClassifier = this.value === 'classifier';
+            document.getElementById('mg-selector-row').style.display = isClassifier ? '' : 'none';
+            document.getElementById('mg-threshold-row').style.display = isClassifier ? '' : 'none';
+            document.getElementById('mg-rules-row').style.display = isClassifier ? 'none' : '';
+        };
+    }
+
+    async saveGroup(event, isEdit) {
+        event.preventDefault();
+        var id = document.getElementById('mg-id').value.trim();
+        var strategy = document.getElementById('mg-strategy').value;
+        var targets = document.getElementById('mg-targets').value;
+        var selectorModel = document.getElementById('mg-selector-model').value.trim() || null;
+        var thresholdVal = document.getElementById('mg-threshold').value;
+        var rules = document.getElementById('mg-rules').value.trim() || null;
+
+        try { JSON.parse(targets); } catch (e) { alert('Targets must be valid JSON array'); return; }
+        if (rules) { try { JSON.parse(rules); } catch (e) { alert('Heuristic rules must be valid JSON'); return; } }
+
+        var body = { id: id, strategy: strategy, targets: targets, selector_model: selectorModel, heuristic_rules: rules };
+        if (thresholdVal) body.complexity_threshold = parseInt(thresholdVal);
+
+        try {
+            if (isEdit) {
+                await api.put('/api/model-groups/' + encodeURIComponent(id), body);
+            } else {
+                await api.post('/api/model-groups', body);
+            }
+            document.getElementById('model-group-form').style.display = 'none';
+            await this.loadGroups();
+        } catch (err) {
+            alert('Failed to save: ' + err.message);
+        }
+    }
+
+    async deleteGroup(id) {
+        if (!confirm('Delete model group "' + id + '"? This cannot be undone.')) return;
+        try {
+            await api.delete('/api/model-groups/' + encodeURIComponent(id));
+            await this.loadGroups();
+        } catch (err) {
+            alert('Failed to delete: ' + err.message);
+        }
+    }
+
+    esc(str) {
+        if (!str) return '';
+        return String(str).replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');
+    }
+}
+
+var modelGroupsPage = new ModelGroupsPage();