diff --git a/litellm/litellm_core_utils/model_param_helper.py b/litellm/litellm_core_utils/model_param_helper.py
index 91f2f1341cf..4d45c47c224 100644
--- a/litellm/litellm_core_utils/model_param_helper.py
+++ b/litellm/litellm_core_utils/model_param_helper.py
@@ -17,15 +17,16 @@ from litellm.types.rerank import RerankRequest
 
 
 class ModelParamHelper:
+    # Cached at class level — deterministic set built from static OpenAI type annotations
+    _relevant_logging_args: frozenset = frozenset()
+
     @staticmethod
     def get_standard_logging_model_parameters(
         model_parameters: dict,
     ) -> dict:
         """ """
         standard_logging_model_parameters: dict = {}
-        supported_model_parameters = (
-            ModelParamHelper._get_relevant_args_to_use_for_logging()
-        )
+        supported_model_parameters = ModelParamHelper._relevant_logging_args
 
         for key, value in model_parameters.items():
             if key in supported_model_parameters:
@@ -172,3 +173,8 @@ class ModelParamHelper:
         Get the kwargs to exclude from the cache key
         """
         return set(["metadata"])
+
+
+ModelParamHelper._relevant_logging_args = frozenset(
+    ModelParamHelper._get_relevant_args_to_use_for_logging()
+)
diff --git a/tests/test_litellm/test_model_param_helper.py b/tests/test_litellm/test_model_param_helper.py
new file mode 100644
index 00000000000..c6e4b864a22
--- /dev/null
+++ b/tests/test_litellm/test_model_param_helper.py
@@ -0,0 +1,33 @@
+from litellm.litellm_core_utils.model_param_helper import ModelParamHelper
+
+
+def test_cached_relevant_logging_args_matches_dynamic():
+    """Verify the cached frozenset matches the dynamically computed set."""
+    cached = ModelParamHelper._relevant_logging_args
+    dynamic = ModelParamHelper._get_relevant_args_to_use_for_logging()
+    assert cached == dynamic
+    assert isinstance(cached, frozenset)
+
+
+def test_get_standard_logging_model_parameters_filters():
+    """Verify model parameters are filtered to only supported keys."""
+    params = {"temperature": 0.7, "messages": [{"role": "user"}], "max_tokens": 100}
+    result = ModelParamHelper.get_standard_logging_model_parameters(params)
+    assert "temperature" in result
+    assert "max_tokens" in result
+    assert "messages" not in result  # excluded prompt content
+
+
+def test_get_standard_logging_model_parameters_excludes_prompt_content():
+    """Verify all prompt content keys are excluded."""
+    params = {
+        "messages": [{"role": "user", "content": "hi"}],
+        "prompt": "hello",
+        "input": "test",
+        "temperature": 0.5,
+    }
+    result = ModelParamHelper.get_standard_logging_model_parameters(params)
+    assert "messages" not in result
+    assert "prompt" not in result
+    assert "input" not in result
+    assert result == {"temperature": 0.5}