diff --git a/apps/web/src/app/api/models/up/route.ts b/apps/web/src/app/api/models/up/route.ts
index ba10afa238..3563fc263a 100644
--- a/apps/web/src/app/api/models/up/route.ts
+++ b/apps/web/src/app/api/models/up/route.ts
@@ -206,6 +206,23 @@ export async function GET(
     const hasSignificantDrop = Object.values(models).some(m => m.monitored && !m.healthy);
     const status = hasSignificantDrop ? 503 : 200;
 
+    if (hasSignificantDrop) {
+      const unhealthy = Object.entries(models)
+        .filter(([, m]) => m.monitored && !m.healthy)
+        .map(([model, m]) => ({
+          model,
+          currentRequests: m.currentRequests,
+          previousRequests: m.previousRequests,
+          baselineRequests: m.baselineRequests,
+          percentChange: m.percentChange,
+          uniqueUsersBaseline: m.uniqueUsersBaseline,
+        }));
+      console.error('[models/up] returning 503: unhealthy monitored models', {
+        anchorTime: (anchorTime ?? new Date()).toISOString(),
+        unhealthy,
+      });
+    }
+
     return NextResponse.json(
       {
         healthy: !hasSignificantDrop,