diff --git a/tests/test_litellm/test_cost_calculator.py b/tests/test_litellm/test_cost_calculator.py
index 50eec369c07..aef17f3d5d0 100644
--- a/tests/test_litellm/test_cost_calculator.py
+++ b/tests/test_litellm/test_cost_calculator.py
@@ -113,7 +113,7 @@ def test_completion_cost_uses_response_model_for_dynamic_routing(_local_model_co
 
 def test_completion_cost_strips_dated_azure_snapshot_model(_local_model_cost_map: None) -> None:
     dated_response = ModelResponse(
-        model="gpt-5.6-luna-2026-07-09",
+        model="gpt-5.6-luna-2099-01-01",
         choices=[Choices(index=0, message=Message(role="assistant", content="hi"), finish_reason="stop")],
         usage=Usage(prompt_tokens=100, completion_tokens=50, total_tokens=150),
     )
diff --git a/tests/test_litellm/test_utils.py b/tests/test_litellm/test_utils.py
index 71af3cf76a6..d2eb40bedca 100644
--- a/tests/test_litellm/test_utils.py
+++ b/tests/test_litellm/test_utils.py
@@ -186,8 +186,8 @@ def test_get_model_info_strips_openai_finetune_ids_without_a_custom_suffix(local
 @pytest.mark.parametrize(
     ("model", "custom_llm_provider", "expected_key"),
     [
-        ("gpt-5.6-luna-2026-07-09", "openai", "gpt-5.6-luna"),
-        ("gpt-5.6-luna-2026-07-09", "azure", "azure/gpt-5.6-luna"),
+        ("gpt-5.6-luna-2099-01-01", "openai", "gpt-5.6-luna"),
+        ("gpt-5.6-luna-2099-01-01", "azure", "azure/gpt-5.6-luna"),
     ],
 )
 def test_get_model_info_falls_back_from_dated_snapshot_to_undated_entry(