diff --git a/packages/app/server/claude-proxy.ts b/packages/app/server/claude-proxy.ts
index 187327e3..99c5cfff 100644
--- a/packages/app/server/claude-proxy.ts
+++ b/packages/app/server/claude-proxy.ts
@@ -93,7 +93,7 @@ const SEARCH_WEB_TOOL = {
 
 function mapModelToApi(model: string): string {
   if (model?.includes('opus')) return 'claude-opus-4-20250514'
-  if (model?.includes('haiku')) return 'claude-3-5-haiku-20241022'
+  if (model?.includes('haiku')) return 'claude-haiku-4-5-20251001'
   return 'claude-sonnet-4-20250514'
 }
 
diff --git a/packages/app/src/__tests__/proxy.test.ts b/packages/app/src/__tests__/proxy.test.ts
index f5b6fa96..6145ac24 100644
--- a/packages/app/src/__tests__/proxy.test.ts
+++ b/packages/app/src/__tests__/proxy.test.ts
@@ -40,7 +40,7 @@ describe('Proxy Integration', () => {
   describe('Model mapping', () => {
     function mapModelToApi(model: string): string {
       if (model?.includes('opus')) return 'claude-opus-4-20250514'
-      if (model?.includes('haiku')) return 'claude-3-5-haiku-20241022'
+      if (model?.includes('haiku')) return 'claude-haiku-4-5-20251001'
       return 'claude-sonnet-4-20250514'
     }
 
@@ -55,7 +55,7 @@ describe('Proxy Integration', () => {
     })
 
     it('should map haiku model correctly', () => {
-      expect(mapModelToApi('haiku')).toBe('claude-3-5-haiku-20241022')
+      expect(mapModelToApi('haiku')).toBe('claude-haiku-4-5-20251001')
     })
 
     it('should default to sonnet for unknown models', () => {