diff --git a/Directory.Packages.props b/Directory.Packages.props
index 620d2d57dad..76c6d5f4a16 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -102,7 +102,7 @@
     
     
     
-    
+    
      
     
     
diff --git a/eng/Versions.props b/eng/Versions.props
index b4305da9776..3eeed805756 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -41,8 +41,8 @@
     11.0.0-beta.25457.1
     11.0.0-beta.25457.1
     
-    9.9.0
-    9.9.0-preview.1.25458.4
+    9.9.1
+    9.9.1-preview.1.25474.6
     9.9.0
     9.9.0
     9.9.0
diff --git a/playground/GitHubModelsEndToEnd/GitHubModelsEndToEnd.WebStory/Program.cs b/playground/GitHubModelsEndToEnd/GitHubModelsEndToEnd.WebStory/Program.cs
index 8d472616f68..1e019a25635 100644
--- a/playground/GitHubModelsEndToEnd/GitHubModelsEndToEnd.WebStory/Program.cs
+++ b/playground/GitHubModelsEndToEnd/GitHubModelsEndToEnd.WebStory/Program.cs
@@ -8,7 +8,7 @@
 
 builder.AddServiceDefaults();
 
-builder.AddAzureChatCompletionsClient("chat", settings => settings.EnableSensitiveTelemetryData = true)
+builder.AddAzureChatCompletionsClient("chat")
        .AddChatClient()
        .UseFunctionInvocation();
 
diff --git a/src/Components/Aspire.Azure.AI.Inference/Aspire.Azure.AI.Inference.csproj b/src/Components/Aspire.Azure.AI.Inference/Aspire.Azure.AI.Inference.csproj
index 298f6deefd2..1845c9398b7 100644
--- a/src/Components/Aspire.Azure.AI.Inference/Aspire.Azure.AI.Inference.csproj
+++ b/src/Components/Aspire.Azure.AI.Inference/Aspire.Azure.AI.Inference.csproj
@@ -13,6 +13,7 @@
   
 
   
+    
     
     
     
diff --git a/src/Components/Aspire.Azure.AI.Inference/ChatCompletionsClientSettings.cs b/src/Components/Aspire.Azure.AI.Inference/ChatCompletionsClientSettings.cs
index 56794af9b24..e9f0a355c21 100644
--- a/src/Components/Aspire.Azure.AI.Inference/ChatCompletionsClientSettings.cs
+++ b/src/Components/Aspire.Azure.AI.Inference/ChatCompletionsClientSettings.cs
@@ -68,13 +68,16 @@ public sealed class ChatCompletionsClientSettings : IConnectionStringSettings
     /// 
     ///  if potentially sensitive information should be included in telemetry;
     ///  if telemetry shouldn't include raw inputs and outputs.
-    /// The default value is .
+    /// The default value is , unless the OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT
+    /// environment variable is set to "true" (case-insensitive).
     /// 
     /// 
     /// By default, telemetry includes metadata, such as token counts, but not raw inputs
     /// and outputs, such as message content, function call arguments, and function call results.
+    /// The default value can be overridden by setting the OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT
+    /// environment variable to "true". Explicitly setting this property will override the environment variable.
     /// 
-    public bool EnableSensitiveTelemetryData { get; set; }
+    public bool EnableSensitiveTelemetryData { get; set; } = TelemetryHelpers.EnableSensitiveDataDefault;
 
     /// 
     /// Parses a connection string and populates the settings properties.
diff --git a/src/Components/Aspire.Azure.AI.OpenAI/Aspire.Azure.AI.OpenAI.csproj b/src/Components/Aspire.Azure.AI.OpenAI/Aspire.Azure.AI.OpenAI.csproj
index 979b678061e..914f194dc47 100644
--- a/src/Components/Aspire.Azure.AI.OpenAI/Aspire.Azure.AI.OpenAI.csproj
+++ b/src/Components/Aspire.Azure.AI.OpenAI/Aspire.Azure.AI.OpenAI.csproj
@@ -14,6 +14,7 @@
   
 
   
+    
     
     
     
diff --git a/src/Components/Aspire.Azure.AI.OpenAI/AzureOpenAISettings.cs b/src/Components/Aspire.Azure.AI.OpenAI/AzureOpenAISettings.cs
index 7139088c1b8..9567af410d1 100644
--- a/src/Components/Aspire.Azure.AI.OpenAI/AzureOpenAISettings.cs
+++ b/src/Components/Aspire.Azure.AI.OpenAI/AzureOpenAISettings.cs
@@ -67,13 +67,16 @@ public sealed class AzureOpenAISettings : IConnectionStringSettings
     /// 
     ///  if potentially sensitive information should be included in telemetry;
     ///  if telemetry shouldn't include raw inputs and outputs.
-    /// The default value is .
+    /// The default value is , unless the OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT
+    /// environment variable is set to "true" (case-insensitive).
     /// 
     /// 
     /// By default, telemetry includes metadata, such as token counts, but not raw inputs
     /// and outputs, such as message content, function call arguments, and function call results.
+    /// The default value can be overridden by setting the OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT
+    /// environment variable to "true". Explicitly setting this property will override the environment variable.
     /// 
-    public bool EnableSensitiveTelemetryData { get; set; }
+    public bool EnableSensitiveTelemetryData { get; set; } = TelemetryHelpers.EnableSensitiveDataDefault;
 
     void IConnectionStringSettings.ParseConnectionString(string? connectionString)
     {
diff --git a/src/Components/Common/AITelemetryHelpers.cs b/src/Components/Common/AITelemetryHelpers.cs
new file mode 100644
index 00000000000..acc378786dc
--- /dev/null
+++ b/src/Components/Common/AITelemetryHelpers.cs
@@ -0,0 +1,16 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Aspire;
+
+internal static class TelemetryHelpers
+{
+    /// Gets a value indicating whether the OpenTelemetry clients should enable their EnableSensitiveData property's by default.
+    /// 
+    /// Defaults to false. May be overridden by setting the OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT environment variable to "true".
+    /// Mirrors Microsoft.Extensions.AI default: https://github.com/dotnet/extensions/blob/c4e57fb1e6b8403a527ea3cd737f1146dcbc1f31/src/Libraries/Microsoft.Extensions.AI/TelemetryHelpers.cs#L14
+    /// 
+    public static bool EnableSensitiveDataDefault { get; } =
+        Environment.GetEnvironmentVariable("OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT") is string envVar &&
+        string.Equals(envVar, "true", StringComparison.OrdinalIgnoreCase);
+}