diff --git a/src/shared/utils/modelParser.ts b/src/shared/utils/modelParser.ts
index 8d9fbf37..edb58940 100644
--- a/src/shared/utils/modelParser.ts
+++ b/src/shared/utils/modelParser.ts
@@ -28,6 +28,7 @@ const KNOWN_FAMILIES: KnownModelFamily[] = ['sonnet', 'opus', 'haiku'];
  *
  * Supported formats:
  * - New format: claude-{family}-{major}-{minor}-{date} (e.g., "claude-sonnet-4-5-20250929")
+ * - New format short: claude-{family}-{major} (e.g., "claude-sonnet-5")
  * - Old format: claude-{major}-{family}-{date} (e.g., "claude-3-opus-20240229")
  * - Old format with minor: claude-{major}-{minor}-{family}-{date} (e.g., "claude-3-5-sonnet-20241022")
  */
@@ -87,12 +88,9 @@ export function parseModelString(model: string | undefined): ModelInfo | null {
 
   // Determine format based on family position
   if (familyIndex === 1) {
-    // New format: claude-{family}-{major}-{minor}-{date}
+    // New format: claude-{family}-{major}[-{minor}][-{date}]
     // e.g., claude-sonnet-4-5-20250929 -> ["claude", "sonnet", "4", "5", "20250929"]
-    if (parts.length < 4) {
-      return null;
-    }
-
+    // e.g., claude-sonnet-5 -> ["claude", "sonnet", "5"]
     majorVersion = parseInt(parts[2], 10);
     if (isNaN(majorVersion)) {
       return null;
diff --git a/test/shared/utils/modelParser.test.ts b/test/shared/utils/modelParser.test.ts
index fae2532c..427a5d14 100644
--- a/test/shared/utils/modelParser.test.ts
+++ b/test/shared/utils/modelParser.test.ts
@@ -102,6 +102,20 @@ describe('modelParser', () => {
       });
     });
 
+    it('should parse short format without minor or date: claude-sonnet-5', () => {
+      const result = parseModelString('claude-sonnet-5');
+      expect(result).toEqual({
+        name: 'sonnet5',
+        family: 'sonnet',
+        majorVersion: 5,
+        minorVersion: null,
+      });
+    });
+
+    it('should return null for invalid short format with non-numeric version', () => {
+      expect(parseModelString('claude-sonnet-x')).toBeNull();
+    });
+
     it('should return null for invalid format with only two parts', () => {
       expect(parseModelString('claude-sonnet')).toBeNull();
     });