diff --git a/odoo/addons/base/tests/test_api.py b/odoo/addons/base/tests/test_api.py
index 8b2c81171f8..7a018fa1de4 100644
--- a/odoo/addons/base/tests/test_api.py
+++ b/odoo/addons/base/tests/test_api.py
@@ -670,6 +670,38 @@ class TestAPI(SavepointCaseWithUserDemo):
         by_name_ids = [p.id for p in sorted(ps, key=lambda p: p.name, reverse=True)]
         self.assertEqual(ps.sorted('name', reverse=True).ids, by_name_ids)
 
+        # sorted doesn't filter out new records but don't sort them either (limitation)
+        new_p = self.env['res.partner'].new({
+            'child_ids': [
+                Command.create({'name': 'z'}),
+                Command.create({'name': 'a'}),
+            ],
+        })
+        self.assertEqual(len(new_p.child_ids.sorted()), 2)
+
+        # sorted keeps the _prefetch_ids
+        partners_with_children = self.env['res.partner'].create([
+            {
+                'name': 'required',
+                'child_ids': [
+                    Command.create({'name': 'z'}),
+                    Command.create({'name': 'a'}),
+                ],
+            },
+            {
+                'name': 'required',
+                'child_ids': [
+                    Command.create({'name': 'z'}),
+                    Command.create({'name': 'a'}),
+                ],
+            },
+        ])
+        partners_with_children.invalidate_model(['name'])
+        # Only one query to fetch name of children of each partner
+        with self.assertQueryCount(1):
+            for partner in partners_with_children:
+                partner.child_ids.sorted('id').mapped('name')
+
     def test_group_on(self):
         p0, p1, p2 = self.env['res.partner'].create([
             {'name': "bob", 'function': "guest"},
diff --git a/odoo/models.py b/odoo/models.py
index 986ad27a86f..5ce03fa100c 100644
--- a/odoo/models.py
+++ b/odoo/models.py
@@ -6268,11 +6268,16 @@ class BaseModel(metaclass=MetaModel):
             records.sorted(key=lambda r: r.name)
         """
         if key is None:
-            recs = self.search([('id', 'in', self.ids)])
-            return self.browse(reversed(recs._ids)) if reverse else recs
-        if isinstance(key, str):
-            key = itemgetter(key)
-        return self.browse(item.id for item in sorted(self, key=key, reverse=reverse))
+            if any(self._ids):
+                ids = self.search([('id', 'in', self.ids)])._ids
+            else:  # Don't support new ids because search() doesn't work on new records
+                ids = self._ids
+            ids = tuple(reversed(ids)) if reverse else ids
+        else:
+            if isinstance(key, str):
+                key = itemgetter(key)
+            ids = tuple(item.id for item in sorted(self, key=key, reverse=reverse))
+        return self.__class__(self.env, ids, self._prefetch_ids)
 
     def update(self, values):
         """ Update the records in ``self`` with ``values``. """