diff --git a/src/sse/services/model.ts b/src/sse/services/model.ts
index 49145c50e3..ec606b7da0 100644
--- a/src/sse/services/model.ts
+++ b/src/sse/services/model.ts
@@ -22,8 +22,10 @@ export async function resolveModelAlias(alias) {
 export async function getModelInfo(modelStr) {
   const parsed = parseModel(modelStr);
 
+  // Check custom provider nodes first (for both alias and non-alias formats)
   // Check custom provider nodes first (for both alias and non-alias formats)
   if (parsed.providerAlias || parsed.provider) {
+    // Ensure prefixToCheck is always a concise identifier, not a full model string
     const prefixToCheck = parsed.providerAlias || parsed.provider;
 
     // Check OpenAI Compatible nodes