diff --git a/apps/backend/src/lib/ai/models.ts b/apps/backend/src/lib/ai/models.ts
index 09cd481ce..94b12f3e8 100644
--- a/apps/backend/src/lib/ai/models.ts
+++ b/apps/backend/src/lib/ai/models.ts
@@ -29,17 +29,17 @@ const MODEL_SELECTION_MATRIX: Record<
   smart: {
     slow: {
       authenticated: { modelId: "openai/gpt-5.5" },
-      unauthenticated: { modelId: "z-ai/glm-5.2" },
+      unauthenticated: { modelId: "z-ai/glm-5.2:nitro" },
     },
     fast: {
       authenticated: { modelId: "openai/gpt-5.5" },
-      unauthenticated: { modelId: "z-ai/glm-5:nitro" },
+      unauthenticated: { modelId: "z-ai/glm-5.2:nitro" },
     },
   },
   smartest: {
     slow: {
       authenticated: { modelId: "openai/gpt-5.5" },
-      unauthenticated: { modelId: "z-ai/glm-5.2" },
+      unauthenticated: { modelId: "z-ai/glm-5.2:nitro" },
     },
     fast: {
       authenticated: { modelId: "openai/gpt-5.5" },