diff --git a/litellm/llms/azure/chat/gpt_5_transformation.py b/litellm/llms/azure/chat/gpt_5_transformation.py
index 7e8625ad4cf..a4992128adc 100644
--- a/litellm/llms/azure/chat/gpt_5_transformation.py
+++ b/litellm/llms/azure/chat/gpt_5_transformation.py
@@ -15,6 +15,17 @@ class AzureOpenAIGPT5Config(AzureOpenAIConfig, OpenAIGPT5Config):
 
     GPT5_SERIES_ROUTE = "gpt5_series/"
 
+    @classmethod
+    def _supports_reasoning_effort_level(cls, model: str, level: str) -> bool:
+        """Strip the gpt5_series/ routing prefix and pass azure as provider."""
+        from litellm.utils import _supports_factory
+
+        return _supports_factory(
+            model=model.replace(cls.GPT5_SERIES_ROUTE, ""),
+            custom_llm_provider="azure",
+            key=f"supports_{level}_reasoning_effort",
+        )
+
     @classmethod
     def is_model_gpt_5_model(cls, model: str) -> bool:
         """Check if the Azure model string refers to a gpt-5 variant.
@@ -43,10 +54,15 @@ class AzureOpenAIGPT5Config(AzureOpenAIConfig, OpenAIGPT5Config):
         if "tool_choice" not in params:
             params.append("tool_choice")
 
-        # Only gpt-5.2 has been verified to support logprobs on Azure
+        # Only gpt-5.2 has been verified to support logprobs on Azure.
+        # The OpenAI base class may include logprobs for gpt-5.1 (supported on openai.com),
+        # but we enforce the Azure-specific constraint here.
         if self.is_model_gpt_5_2_model(model):
-            azure_supported_params = ["logprobs", "top_logprobs"]
-            params.extend(azure_supported_params)
+            for p in ("logprobs", "top_logprobs"):
+                if p not in params:
+                    params.append(p)
+        else:
+            params = [p for p in params if p not in ("logprobs", "top_logprobs")]
 
         return params
 
diff --git a/tests/test_litellm/llms/openai/test_gpt5_transformation.py b/tests/test_litellm/llms/openai/test_gpt5_transformation.py
index 1fc984510ef..89578e3e7c4 100644
--- a/tests/test_litellm/llms/openai/test_gpt5_transformation.py
+++ b/tests/test_litellm/llms/openai/test_gpt5_transformation.py
@@ -1,8 +1,8 @@
 import pytest
 
 import litellm
-from litellm.llms.openai.openai import OpenAIConfig
 from litellm.llms.openai.chat.gpt_5_transformation import OpenAIGPT5Config
+from litellm.llms.openai.openai import OpenAIConfig
 
 
 @pytest.fixture()
@@ -260,19 +260,21 @@ def test_gpt5_drops_reasoning_effort_xhigh_when_requested(config: OpenAIConfig):
 
 # GPT-5.1 temperature handling tests
 def test_gpt5_1_model_detection(gpt5_config: OpenAIGPT5Config):
-    """Test that GPT-5.1 models are correctly detected."""
-    assert gpt5_config.is_model_gpt_5_1_model("gpt-5.1")
-    assert gpt5_config.is_model_gpt_5_1_model("gpt-5.1-codex")
-    assert gpt5_config.is_model_gpt_5_1_model("gpt-5.1-codex-max")
-    assert gpt5_config.is_model_gpt_5_1_model("gpt-5.1-chat")
-    assert gpt5_config.is_model_gpt_5_1_model("gpt-5.2")
-    assert gpt5_config.is_model_gpt_5_1_model("gpt-5.2-2025-12-11")
-    assert not gpt5_config.is_model_gpt_5_1_model("gpt-5.2-chat")
-    assert not gpt5_config.is_model_gpt_5_1_model("gpt-5.2-chat-latest")
-    assert not gpt5_config.is_model_gpt_5_1_model("gpt-5.2-pro")
-    assert not gpt5_config.is_model_gpt_5_1_model("gpt-5")
-    assert not gpt5_config.is_model_gpt_5_1_model("gpt-5-mini")
-    assert not gpt5_config.is_model_gpt_5_1_model("gpt-5-codex")
+    """Test that models supporting reasoning_effort='none' are correctly detected via model map."""
+    # gpt-5.1 and gpt-5.2 chat variants support none
+    assert gpt5_config._supports_reasoning_effort_level("gpt-5.1", "none")
+    assert gpt5_config._supports_reasoning_effort_level("gpt-5.1-2025-11-13", "none")
+    assert gpt5_config._supports_reasoning_effort_level("gpt-5.1-chat-latest", "none")
+    assert gpt5_config._supports_reasoning_effort_level("gpt-5.2", "none")
+    assert gpt5_config._supports_reasoning_effort_level("gpt-5.2-2025-12-11", "none")
+    # codex/pro/chat variants do not support none
+    assert not gpt5_config._supports_reasoning_effort_level("gpt-5.1-codex", "none")
+    assert not gpt5_config._supports_reasoning_effort_level("gpt-5.1-codex-max", "none")
+    assert not gpt5_config._supports_reasoning_effort_level("gpt-5.2-chat-latest", "none")
+    assert not gpt5_config._supports_reasoning_effort_level("gpt-5.2-pro", "none")
+    assert not gpt5_config._supports_reasoning_effort_level("gpt-5", "none")
+    assert not gpt5_config._supports_reasoning_effort_level("gpt-5-mini", "none")
+    assert not gpt5_config._supports_reasoning_effort_level("gpt-5-codex", "none")
 
 
 def test_gpt5_1_temperature_with_reasoning_effort_none(config: OpenAIConfig):