diff --git a/tests/test_litellm/test_utils.py b/tests/test_litellm/test_utils.py
index 71af3cf76a6..2b94fdffea9 100644
--- a/tests/test_litellm/test_utils.py
+++ b/tests/test_litellm/test_utils.py
@@ -191,15 +191,32 @@ def test_get_model_info_strips_openai_finetune_ids_without_a_custom_suffix(local
     ],
 )
 def test_get_model_info_falls_back_from_dated_snapshot_to_undated_entry(
-    local_model_cost_map, model, custom_llm_provider, expected_key
-):
-    info = litellm.get_model_info(model=model, custom_llm_provider=custom_llm_provider)
+    local_model_cost_map: None,
+    monkeypatch: pytest.MonkeyPatch,
+    model: str,
+    custom_llm_provider: str,
+    expected_key: str,
+) -> None:
+    monkeypatch.delitem(litellm.model_cost, model, raising=False)
+    monkeypatch.delitem(litellm.model_cost, f"{custom_llm_provider}/{model}", raising=False)
+    assert expected_key in litellm.model_cost
+    info: Final = litellm.get_model_info(model=model, custom_llm_provider=custom_llm_provider)
     assert info["key"] == expected_key
 
 
-def test_get_model_info_prefers_exact_dated_key_over_stripped(local_model_cost_map):
-    info = litellm.get_model_info(model="gpt-4o-2024-08-06", custom_llm_provider="openai")
-    assert info["key"] == "gpt-4o-2024-08-06"
+@pytest.mark.parametrize(
+    ("model", "custom_llm_provider", "expected_key"),
+    [
+        ("gpt-4o-2024-08-06", "openai", "gpt-4o-2024-08-06"),
+        ("gpt-5.6-luna-2026-07-09", "azure", "azure/gpt-5.6-luna-2026-07-09"),
+    ],
+)
+def test_get_model_info_prefers_exact_dated_key_over_stripped(
+    local_model_cost_map: None, model: str, custom_llm_provider: str, expected_key: str
+) -> None:
+    assert expected_key in litellm.model_cost
+    info: Final = litellm.get_model_info(model=model, custom_llm_provider=custom_llm_provider)
+    assert info["key"] == expected_key
 
 
 def test_check_provider_match_azure_ai_allows_openai_and_azure():