diff --git a/litellm/llms/azure_ai/anthropic/transformation.py b/litellm/llms/azure_ai/anthropic/transformation.py
index a25559ecef3..466be954a25 100644
--- a/litellm/llms/azure_ai/anthropic/transformation.py
+++ b/litellm/llms/azure_ai/anthropic/transformation.py
@@ -115,24 +115,26 @@ class AzureAnthropicConfig(AnthropicConfig):
         self,
         model: str,
         messages: list[AllMessageValues],
-        optional_params: dict[str, object],
-        litellm_params: dict[str, object],
-        headers: dict[str, object],
-    ) -> dict[str, object]:
+        optional_params: dict,
+        litellm_params: dict,
+        headers: dict,
+    ) -> dict:
         """
         Transform request using parent AnthropicConfig, then remove unsupported params.
         Azure Anthropic doesn't support extra_body, max_retries, or stream_options parameters.
         """
         _promote_extra_body_to_optional_params(optional_params)
 
-        data: Final[dict[str, object]] = {
-            **super().transform_request(
-                model=model,
-                messages=messages,
-                optional_params=optional_params,
-                litellm_params=litellm_params,
-                headers=headers,
-            )
-        }
+        data: Final = super().transform_request(
+            model=model,
+            messages=messages,
+            optional_params=optional_params,
+            litellm_params=litellm_params,
+            headers=headers,
+        )
 
-        return {key: value for key, value in data.items() if key not in _AZURE_ANTHROPIC_NON_BODY_PARAMS}
+        return {
+            key: value
+            for key, value in data.items()  # pyright: ignore[reportUnknownVariableType]  # Anthropic base returns a bare request dict
+            if key not in _AZURE_ANTHROPIC_NON_BODY_PARAMS
+        }
diff --git a/tests/unit/test_azure_ad_token_credential_resolution.py b/tests/unit/test_azure_ad_token_credential_resolution.py
index c0469842c0f..d2901f8adaa 100644
--- a/tests/unit/test_azure_ad_token_credential_resolution.py
+++ b/tests/unit/test_azure_ad_token_credential_resolution.py
@@ -71,9 +71,9 @@ class TestCredentialLiteLLMParamsAzureAdToken:
             "azure_ad_token": "tok-123",
             "api_key": None,  # M2M deployment has no static key
         }
-        rebuilt = CredentialLiteLLMParams(
-            **{k: v for k, v in source.items() if v is not None}
-        ).model_dump(exclude_none=True)
+        rebuilt = CredentialLiteLLMParams(**{k: v for k, v in source.items() if v is not None}).model_dump(
+            exclude_none=True
+        )
         assert rebuilt.get("azure_ad_token") == "tok-123"
         assert rebuilt.get("api_base") == "https://my.openai.azure.com"
         assert "api_key" not in rebuilt
@@ -103,9 +103,7 @@ class TestRouterCredentialResolution:
             ]
         )
 
-        credentials = router.get_deployment_credentials_with_provider(
-            model_id=deployment_id
-        )
+        credentials = router.get_deployment_credentials_with_provider(model_id=deployment_id)
         assert credentials is not None
         assert credentials.get("azure_ad_token") == "tok-azure-m2m-xyz", (
             "Router credential resolution dropped azure_ad_token; the "
@@ -135,9 +133,7 @@ class TestRouterCredentialResolution:
             ]
         )
 
-        credentials = router.get_deployment_credentials_with_provider(
-            model_id=deployment_id
-        )
+        credentials = router.get_deployment_credentials_with_provider(model_id=deployment_id)
         assert credentials is not None
         assert credentials.get("api_key") == "sk-static-key"
         assert "azure_ad_token" not in credentials
@@ -172,9 +168,7 @@ class TestRouterCredentialResolutionS3OutputBucket:
             ]
         )
 
-        credentials = router.get_deployment_credentials_with_provider(
-            model_id=deployment_id
-        )
+        credentials = router.get_deployment_credentials_with_provider(model_id=deployment_id)
         assert credentials is not None
         assert credentials.get("s3_output_bucket_name") == "out-bucket", (
             "Router credential resolution dropped s3_output_bucket_name; "
@@ -203,9 +197,7 @@ class TestRouterCredentialResolutionS3OutputBucket:
             ]
         )
 
-        credentials = router.get_deployment_credentials_with_provider(
-            model_id=deployment_id
-        )
+        credentials = router.get_deployment_credentials_with_provider(model_id=deployment_id)
         assert credentials is not None
         assert credentials.get("s3_bucket_name") == "in-bucket"
         assert "s3_output_bucket_name" not in credentials
@@ -227,9 +219,7 @@ def test_azure_anthropic_request_body_does_not_include_azure_credentials() -> No
     }
     output_config: Final[dict[str, dict[str, str]]] = {"format": {"type": "json_object"}}
     extra_body_params: Final[dict[str, str]] = {
-        key: value
-        for key, value in credential_params.items()
-        if key not in {"api_key", "azure_ad_token"}
+        key: value for key, value in credential_params.items() if key not in {"api_key", "azure_ad_token"}
     }
     body: Final[dict[str, object]] = AzureAnthropicConfig().transform_request(
         model="claude-3-5-sonnet-20241022",