diff --git a/google/genai/models.py b/google/genai/models.py
index 0f3c2008..41e29c7a 100644
--- a/google/genai/models.py
+++ b/google/genai/models.py
@@ -23,7 +23,7 @@
 from . import _extra_utils
 from . import _transformers as t
 from . import types
-from ._api_client import ApiClient, HttpOptionsDict
+from ._api_client import ApiClient
 from ._common import get_value_by_path as getv
 from ._common import set_value_by_path as setv
 from .pagers import AsyncPager, Pager
@@ -5739,13 +5739,7 @@ async def list(
     )
     if self._api_client.vertexai:
       config = config.copy()
-      if config.query_base:
-        http_options = (
-            config.http_options if config.http_options else HttpOptionsDict()
-        )
-        http_options['skip_project_and_location_in_path'] = True
-        config.http_options = http_options
-      else:
+      if not config.query_base:
         # Filter for tuning jobs artifacts by labels.
         filter_value = config.filter
         config.filter = (
diff --git a/google/genai/tests/models/test_list.py b/google/genai/tests/models/test_list.py
index 6e16a262..03cb2d40 100644
--- a/google/genai/tests/models/test_list.py
+++ b/google/genai/tests/models/test_list.py
@@ -124,3 +124,18 @@ async def test_async_pager(client):
     pass
   with pytest.raises(IndexError, match='No more pages to fetch.'):
     await pager.next_page()
+
+
+@pytest.mark.asyncio
+async def test_base_models_async_pager(client):
+  pager = await client.aio.models.list(config={'page_size': 10, 'query_base': True})
+
+  assert pager.name == 'models'
+  assert pager.page_size == 10
+  assert len(pager) <= 10
+
+  # Iterate through all the pages. Then next_page() should raise an exception.
+  async for _ in pager:
+    pass
+  with pytest.raises(IndexError, match='No more pages to fetch.'):
+    await pager.next_page()