diff --git a/litellm/caching/_internal_lru_cache.py b/litellm/caching/_internal_lru_cache.py
new file mode 100644
index 000000000000..78df493fc879
--- /dev/null
+++ b/litellm/caching/_internal_lru_cache.py
@@ -0,0 +1,12 @@
+from functools import lru_cache, wraps
+from typing import Callable, TypeVar, cast
+
+RT = TypeVar("RT")  # Return type
+
+
+def typed_lru_cache(maxsize: int = 128) -> Callable:
+    def decorator(func: Callable[..., RT]) -> Callable[..., RT]:
+        wrapped = lru_cache(maxsize=maxsize)(func)
+        return cast(Callable[..., RT], wraps(func)(wrapped))
+
+    return decorator
diff --git a/litellm/litellm_core_utils/get_llm_provider_logic.py b/litellm/litellm_core_utils/get_llm_provider_logic.py
index 834e35c733fa..6c339d7bc8b7 100644
--- a/litellm/litellm_core_utils/get_llm_provider_logic.py
+++ b/litellm/litellm_core_utils/get_llm_provider_logic.py
@@ -1,8 +1,10 @@
-from typing import Optional, Tuple
+from functools import lru_cache
+from typing import Optional, Tuple, overload
 
 import httpx
 
 import litellm
+from litellm.caching._internal_lru_cache import typed_lru_cache
 from litellm.secret_managers.main import get_secret, get_secret_str
 
 from ..types.router import LiteLLM_Params
@@ -84,6 +86,29 @@ def handle_anthropic_text_model_custom_llm_provider(
     return model, custom_llm_provider
 
 
+@overload
+def get_llm_provider(
+    model: str,
+    custom_llm_provider: str,
+    api_base: str,
+    api_key: str,
+    litellm_params: LiteLLM_Params,
+) -> Tuple[str, str, str, str]:
+    pass
+
+
+@overload
+def get_llm_provider(
+    model: str,
+    custom_llm_provider: Optional[str] = None,
+    api_base: Optional[str] = None,
+    api_key: Optional[str] = None,
+    litellm_params: Optional[LiteLLM_Params] = None,
+) -> Tuple[str, str, Optional[str], Optional[str]]:
+    pass
+
+
+@lru_cache(maxsize=16)
 def get_llm_provider(  # noqa: PLR0915
     model: str,
     custom_llm_provider: Optional[str] = None,
diff --git a/litellm/litellm_core_utils/get_supported_openai_params.py b/litellm/litellm_core_utils/get_supported_openai_params.py
index e251784f4e18..62f84e0ebd5a 100644
--- a/litellm/litellm_core_utils/get_supported_openai_params.py
+++ b/litellm/litellm_core_utils/get_supported_openai_params.py
@@ -2,6 +2,7 @@
 
 import litellm
 from litellm import LlmProviders
+from litellm.caching._internal_lru_cache import typed_lru_cache
 from litellm.exceptions import BadRequestError
 
 
diff --git a/litellm/types/router.py b/litellm/types/router.py
index 8c671fe52c8c..7bf54126f704 100644
--- a/litellm/types/router.py
+++ b/litellm/types/router.py
@@ -177,7 +177,7 @@ class GenericLiteLLMParams(BaseModel):
     max_budget: Optional[float] = None
     budget_duration: Optional[str] = None
 
-    model_config = ConfigDict(extra="allow", arbitrary_types_allowed=True)
+    model_config = ConfigDict(extra="allow", arbitrary_types_allowed=True, frozen=True)
 
     def __init__(
         self,
@@ -249,7 +249,7 @@ class LiteLLM_Params(GenericLiteLLMParams):
     """
 
     model: str
-    model_config = ConfigDict(extra="allow", arbitrary_types_allowed=True)
+    model_config = ConfigDict(extra="allow", arbitrary_types_allowed=True, frozen=True)
 
     def __init__(
         self,
diff --git a/tests/llm_translation/test_xai.py b/tests/llm_translation/test_xai.py
index fe909a4d2e1b..de4bfc907d08 100644
--- a/tests/llm_translation/test_xai.py
+++ b/tests/llm_translation/test_xai.py
@@ -6,7 +6,7 @@
 
 sys.path.insert(
     0, os.path.abspath("../..")
-)  # Adds the parent directory to the system-path
+)  # Adds the parent directory to the system path
 
 
 import httpx