diff --git a/open-sse/services/usage.ts b/open-sse/services/usage.ts
index 820f7cfb4a..2bf2edec5f 100644
--- a/open-sse/services/usage.ts
+++ b/open-sse/services/usage.ts
@@ -554,7 +554,9 @@ async function getGlmUsage(apiKey: string, providerSpecificData?: Record<string,
   }
 
   const levelRaw = typeof data.level === "string" ? data.level : "";
-  const plan = levelRaw ? levelRaw.charAt(0).toUpperCase() + levelRaw.slice(1).toLowerCase() : null;
+  const plan = levelRaw
+    ? levelRaw.charAt(0).toUpperCase() + levelRaw.slice(1).toLowerCase()
+    : "Unknown";
 
   return { plan, quotas };
 }
@@ -1818,7 +1820,7 @@ async function getClaudeUsageLegacy(accessToken) {
         if (usageResponse.ok) {
           const usage = await usageResponse.json();
           return {
-            plan: settings.plan || null,
+            plan: settings.plan || "Unknown",
             organization: settings.organization_name,
             quotas: usage,
           };
@@ -1826,7 +1828,7 @@ async function getClaudeUsageLegacy(accessToken) {
       }
 
       return {
-        plan: settings.plan || null,
+        plan: settings.plan || "Unknown",
         organization: settings.organization_name,
         message: "Claude connected. Usage details require admin access.",
       };