diff --git a/ui/src/lib/model-catalogs.ts b/ui/src/lib/model-catalogs.ts
index ea566f9f..e6b03dcb 100644
--- a/ui/src/lib/model-catalogs.ts
+++ b/ui/src/lib/model-catalogs.ts
@@ -1150,6 +1150,9 @@ export function buildUiCatalog(
           : (model.extendedContext ?? staticModel?.extendedContext),
       presetMapping: staticModel?.presetMapping,
       reasoningLevels: model.reasoningLevels ?? staticModel?.reasoningLevels,
+      codexMaxEffort: model.codexMaxEffort ?? staticModel?.codexMaxEffort,
+      codexEfforts: model.codexEfforts ?? staticModel?.codexEfforts,
+      codexServiceTiers: model.codexServiceTiers ?? staticModel?.codexServiceTiers,
     };
   });
 
diff --git a/ui/tests/unit/ui/lib/model-catalogs-codex-merge.test.ts b/ui/tests/unit/ui/lib/model-catalogs-codex-merge.test.ts
new file mode 100644
index 00000000..79b13e09
--- /dev/null
+++ b/ui/tests/unit/ui/lib/model-catalogs-codex-merge.test.ts
@@ -0,0 +1,30 @@
+import { describe, expect, it } from 'vitest';
+import { buildUiCatalog } from '@/lib/model-catalogs';
+
+describe('buildUiCatalog codex tuning metadata merge', () => {
+  it('preserves static codex effort and service-tier metadata when the live catalog omits them', () => {
+    const merged = buildUiCatalog('codex', {
+      provider: 'codex',
+      displayName: 'Codex',
+      defaultModel: 'gpt-5.6-sol',
+      models: [{ id: 'gpt-5.6-sol', name: 'GPT-5.6 Sol' }],
+    });
+
+    const model = merged?.models.find((entry) => entry.id === 'gpt-5.6-sol');
+    expect(model?.codexMaxEffort).toBe('xhigh');
+    expect(model?.codexEfforts).toEqual(['low', 'medium', 'high', 'xhigh']);
+    expect(model?.codexServiceTiers).toEqual(['fast']);
+  });
+
+  it('prefers live metadata over static when the live catalog provides it', () => {
+    const merged = buildUiCatalog('codex', {
+      provider: 'codex',
+      displayName: 'Codex',
+      defaultModel: 'gpt-5.6-sol',
+      models: [{ id: 'gpt-5.6-sol', name: 'GPT-5.6 Sol', codexServiceTiers: [] }],
+    });
+
+    const model = merged?.models.find((entry) => entry.id === 'gpt-5.6-sol');
+    expect(model?.codexServiceTiers).toEqual([]);
+  });
+});