diff --git a/litellm/llms/vertex_ai/common_utils.py b/litellm/llms/vertex_ai/common_utils.py
index 85c23d8603c..5028c0cf5c8 100644
--- a/litellm/llms/vertex_ai/common_utils.py
+++ b/litellm/llms/vertex_ai/common_utils.py
@@ -271,7 +271,7 @@ def supports_response_json_schema(model: str) -> bool:
 
     # Gemini 2.0+ and 2.5+ models support responseJsonSchema
     # Pattern matches: gemini-2.0-*, gemini-2.5-*, gemini-3-*, etc.
-    gemini_2_plus_pattern = re.compile(r"gemini-([2-9]|[1-9]\d+)\.")
+    gemini_2_plus_pattern = re.compile(r"gemini-(?:[2-9]|[1-9]\d+)(?:\.|\-)")
 
     return bool(gemini_2_plus_pattern.search(model_lower))
 
diff --git a/tests/test_litellm/llms/vertex_ai/test_vertex_ai_common_utils.py b/tests/test_litellm/llms/vertex_ai/test_vertex_ai_common_utils.py
index 4768fa439d5..bebf856ee6e 100644
--- a/tests/test_litellm/llms/vertex_ai/test_vertex_ai_common_utils.py
+++ b/tests/test_litellm/llms/vertex_ai/test_vertex_ai_common_utils.py
@@ -17,6 +17,7 @@ from litellm.llms.vertex_ai.common_utils import (
     get_vertex_project_id_from_url,
     pop_vertex_request_labels,
     set_schema_property_ordering,
+    supports_response_json_schema,
     vertex_request_labels_from_litellm_params,
 )
 
@@ -150,6 +151,23 @@ async def test_get_supports_system_message():
     assert result == False
 
 
+@pytest.mark.parametrize(
+    "model, expected",
+    [
+        ("gemini-2.0-flash", True),
+        ("gemini-1.5-pro", False),
+        ("random-model-name", False),
+        ("gemini-3-flash-preview", True),
+        ("gemini-123-pro", True),
+        ("vertex_ai/gemini-3.1-pro-preview", True),
+    ],
+)
+def test_supports_response_json_schema(model: str, expected: bool):
+    """Test supports_response_json_schema correctly detects Gemini 2.0+ model names"""
+
+    assert supports_response_json_schema(model) == expected
+
+
 def test_set_schema_property_ordering_with_excessive_nesting():
     """Test set_schema_property_ordering with excessive nesting > max levels +1 deep."""
     # generate a schema with excessive nesting
@@ -1526,11 +1544,7 @@ def test_vertex_request_labels_from_litellm_params_extracts_requester_metadata()
 
 
 def test_vertex_request_labels_from_litellm_params_accepts_litellm_metadata():
-    lp = {
-        "litellm_metadata": {
-            "requester_metadata": {"team": "platform", "count": 3}
-        }
-    }
+    lp = {"litellm_metadata": {"requester_metadata": {"team": "platform", "count": 3}}}
     assert vertex_request_labels_from_litellm_params(lp) == {"team": "platform"}