Updated Claude model

backend/services/clustering.service.js

@@ -73,7 +73,7 @@ const requestClusters = async (notes, signal) => {
 
   const events = client.messages.stream(
     {
-      model: "claude-sonnet-4-20250514",
+      model: "claude-sonnet-5",
       max_tokens: 4096,
       messages: [
         { role: "user", content: buildPrompt(notes) },

backend/tests/Clustering.service.test.js

@@ -82,7 +82,7 @@ describe('clusterNotes service', () => {
 
     expect(streamMock).toHaveBeenCalledOnce();
     const callArgs = streamMock.mock.calls[0][0];
-    expect(callArgs.model).toBe('claude-sonnet-4-20250514');
+    expect(callArgs.model).toBe('claude-sonnet-5');
     expect(callArgs.max_tokens).toBe(4096);
   });