diff --git a/dotnet/src/Connectors/Connectors.AzureOpenAI.UnitTests/Services/AzureOpenAIChatCompletionServiceTests.cs b/dotnet/src/Connectors/Connectors.AzureOpenAI.UnitTests/Services/AzureOpenAIChatCompletionServiceTests.cs
index d9b4039beb40..24bb3233441c 100644
--- a/dotnet/src/Connectors/Connectors.AzureOpenAI.UnitTests/Services/AzureOpenAIChatCompletionServiceTests.cs
+++ b/dotnet/src/Connectors/Connectors.AzureOpenAI.UnitTests/Services/AzureOpenAIChatCompletionServiceTests.cs
@@ -421,6 +421,7 @@ public async Task GetChatMessageContentsRequestHandlesInternalFieldsCorrectlyAsy
     [InlineData("string", "low")]
     [InlineData("string", "medium")]
     [InlineData("string", "high")]
+    [InlineData("string", "minimal")]
     [InlineData("ChatReasonEffortLevel.Low", "low")]
     [InlineData("ChatReasonEffortLevel.Medium", "medium")]
     [InlineData("ChatReasonEffortLevel.High", "high")]
diff --git a/dotnet/src/Connectors/Connectors.OpenAI.UnitTests/Services/OpenAIChatCompletionServiceTests.cs b/dotnet/src/Connectors/Connectors.OpenAI.UnitTests/Services/OpenAIChatCompletionServiceTests.cs
index b012a0210e6c..6b68d866ff48 100644
--- a/dotnet/src/Connectors/Connectors.OpenAI.UnitTests/Services/OpenAIChatCompletionServiceTests.cs
+++ b/dotnet/src/Connectors/Connectors.OpenAI.UnitTests/Services/OpenAIChatCompletionServiceTests.cs
@@ -1010,6 +1010,7 @@ public async Task GetChatMessageInResponseFormatsAsync(string formatType, string
     [InlineData("string", "low")]
     [InlineData("string", "medium")]
     [InlineData("string", "high")]
+    [InlineData("string", "minimal")]
     [InlineData("ChatReasonEffortLevel.Low", "low")]
     [InlineData("ChatReasonEffortLevel.Medium", "medium")]
     [InlineData("ChatReasonEffortLevel.High", "high")]
diff --git a/dotnet/src/Connectors/Connectors.OpenAI/Core/ClientCore.ChatCompletion.cs b/dotnet/src/Connectors/Connectors.OpenAI/Core/ClientCore.ChatCompletion.cs
index 08a1f486123f..2dce2194b57e 100644
--- a/dotnet/src/Connectors/Connectors.OpenAI/Core/ClientCore.ChatCompletion.cs
+++ b/dotnet/src/Connectors/Connectors.OpenAI/Core/ClientCore.ChatCompletion.cs
@@ -557,6 +557,7 @@ protected virtual ChatCompletionOptions CreateChatCompletionOptions(
                 "LOW" => ChatReasoningEffortLevel.Low,
                 "MEDIUM" => ChatReasoningEffortLevel.Medium,
                 "HIGH" => ChatReasoningEffortLevel.High,
+                "MINIMAL" => new("minimal"),
                 _ => throw new NotSupportedException($"The provided reasoning effort '{textEffortLevel}' is not supported.")
             };
         }
diff --git a/dotnet/src/Connectors/Connectors.OpenAI/Settings/OpenAIPromptExecutionSettings.cs b/dotnet/src/Connectors/Connectors.OpenAI/Settings/OpenAIPromptExecutionSettings.cs
index c4c3e6259823..5824fe412f84 100644
--- a/dotnet/src/Connectors/Connectors.OpenAI/Settings/OpenAIPromptExecutionSettings.cs
+++ b/dotnet/src/Connectors/Connectors.OpenAI/Settings/OpenAIPromptExecutionSettings.cs
@@ -26,7 +26,7 @@ public class OpenAIPromptExecutionSettings : PromptExecutionSettings
     /// Constrains effort on reasoning for reasoning models.
     /// Reducing reasoning effort can result in faster responses and fewer tokens used on reasoning in a response.
     /// Possible values are:
-    /// <para>- <see cref="string"/> values: <c>"low"</c>, <c>"medium"</c>, <c>"high"</c>;</para>
+    /// <para>- <see cref="string"/> values: <c>"low"</c>, <c>"medium"</c>, <c>"high"</c>, <c>"minimal"</c>;</para>
     /// <para>- <see cref="ChatReasoningEffortLevel"/> object;</para>
     /// </remarks>
     [JsonPropertyName("reasoning_effort")]