diff --git a/tests/test_litellm/llms/anthropic/chat/test_anthropic_chat_transformation.py b/tests/test_litellm/llms/anthropic/chat/test_anthropic_chat_transformation.py
index 1707447cd83..f40d58d0eca 100644
--- a/tests/test_litellm/llms/anthropic/chat/test_anthropic_chat_transformation.py
+++ b/tests/test_litellm/llms/anthropic/chat/test_anthropic_chat_transformation.py
@@ -1653,9 +1653,7 @@ def test_max_effort_rejected_for_opus_45():
 
     messages = [{"role": "user", "content": "Test"}]
 
-    with pytest.raises(
-        ValueError, match="effort='max' is not supported by this model"
-    ):
+    with pytest.raises(ValueError, match="effort='max' is not supported by this model"):
         optional_params = {"output_config": {"effort": "max"}}
         config.transform_request(
             model="claude-opus-4-5-20251101",
@@ -2219,6 +2217,11 @@ def test_max_effort_accepted_for_sonnet_46():
         > The ``max`` effort level is available on Claude Mythos Preview,
         > Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6.
     """
+    import litellm
+
+    os.environ["LITELLM_LOCAL_MODEL_COST_MAP"] = "True"
+    litellm.model_cost = litellm.get_model_cost_map(url="")
+
     config = AnthropicConfig()
     messages = [{"role": "user", "content": "Test"}]
 
@@ -2235,6 +2238,11 @@ def test_max_effort_accepted_for_sonnet_46():
 
 def test_max_effort_accepted_for_opus_46():
     """Test that effort='max' works for Opus 4.6."""
+    import litellm
+
+    os.environ["LITELLM_LOCAL_MODEL_COST_MAP"] = "True"
+    litellm.model_cost = litellm.get_model_cost_map(url="")
+
     config = AnthropicConfig()
     messages = [{"role": "user", "content": "Test"}]
 
@@ -2256,6 +2264,11 @@ def test_max_effort_accepted_for_opus_47():
     ``claude-opus-4-7-*`` models. The previous hardcoded ``_is_opus_4_6_model``
     guard rejected the request before it ever reached Anthropic.
     """
+    import litellm
+
+    os.environ["LITELLM_LOCAL_MODEL_COST_MAP"] = "True"
+    litellm.model_cost = litellm.get_model_cost_map(url="")
+
     config = AnthropicConfig()
     messages = [{"role": "user", "content": "Test"}]