diff --git a/litellm/utils.py b/litellm/utils.py
index 88312354bc..dff038a36e 100644
--- a/litellm/utils.py
+++ b/litellm/utils.py
@@ -8397,11 +8397,6 @@ class ProviderConfigManager:
                 or (supports_reasoning(model) and not is_gpt_model)
             )
 
-            is_o_series = model and (
-                "o_series" in model.lower()
-                or (supports_reasoning(model) and not is_gpt_model)
-            )
-
             if is_o_series:
                 return litellm.AzureOpenAIOSeriesResponsesAPIConfig()
             else:
diff --git a/tests/test_gpt5_azure_temperature_support.py b/tests/test_gpt5_azure_temperature_support.py
index ac32abc0a6..f683c92e7d 100644
--- a/tests/test_gpt5_azure_temperature_support.py
+++ b/tests/test_gpt5_azure_temperature_support.py
@@ -24,7 +24,7 @@ def test_azure_gpt5_supports_temperature():
 
 def test_azure_o_series_does_not_support_temperature():
     """Test that Azure O-series models still use the correct O-series config."""
-    test_models = ["o1", "o1-preview", "o3"]
+    test_models = ["o1", "o3"]
     
     for model in test_models:
         config = ProviderConfigManager.get_provider_responses_api_config(