diff --git a/Directory.Build.props b/Directory.Build.props
index 7e4dc9ad808..c742dcd643f 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -47,9 +47,6 @@
     <Deterministic>true</Deterministic>
     <Features>debug-determinism</Features>
 
-    <!-- https://learn.microsoft.com/dotnet/fundamentals/package-validation/overview -->
-    <EnablePackageValidation>true</EnablePackageValidation>
-
     <EnableXlfLocalization>false</EnableXlfLocalization>
     <UpdateXlfOnBuild>false</UpdateXlfOnBuild>
 
diff --git a/eng/MSBuild/Packaging.targets b/eng/MSBuild/Packaging.targets
index 14a5a04d492..1be98cb535a 100644
--- a/eng/MSBuild/Packaging.targets
+++ b/eng/MSBuild/Packaging.targets
@@ -32,6 +32,15 @@
     <None Condition=" '$(IsPackable)' == 'true' and '$(IsShipping)' == 'true' " Include="README.md" Pack="true" PackagePath="\" />
   </ItemGroup>
 
+
+  <PropertyGroup Condition=" '$(EnablePackageValidation)' != 'false' and '$(IsPackable)' == 'true' and '$(IsShipping)' == 'true' and '$(Api)' != 'false' ">
+    <!-- https://learn.microsoft.com/dotnet/fundamentals/package-validation/overview -->
+    <EnablePackageValidation>true</EnablePackageValidation>
+
+    <PackageValidationBaselineVersion Condition=" '$(Stage)' == 'normal' ">$(ApiCompatBaselineVersion)</PackageValidationBaselineVersion> 
+    <PackageValidationBaselineVersion Condition=" '$(Stage)' == 'preview' ">$(ApiCompatBaselineVersion)$(ApiCompatBaselineSuffix)</PackageValidationBaselineVersion> 
+  </PropertyGroup>
+
   <!-- Verify that the minimum supported TFM is actually used. -->
   <Target Name="_VerifyMinimumSupportedTfmForPackagingIsUsed"
           Condition="'$(IsPackable)' == 'true' and '$(DisableNETStandardCompatErrors)' != 'true'">
diff --git a/eng/Versions.props b/eng/Versions.props
index 3b1ad22daed..27815de8359 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -6,7 +6,8 @@
     <PreReleaseVersionLabel>preview</PreReleaseVersionLabel>
     <PreReleaseVersionIteration>1</PreReleaseVersionIteration>
     <VersionPrefix>$(MajorVersion).$(MinorVersion).$(PatchVersion)</VersionPrefix>
-    <ValidateBaseline>true</ValidateBaseline>
+    <ApiCompatBaselineVersion>9.2.0</ApiCompatBaselineVersion>
+    <ApiCompatBaselineSuffix>-preview.1.25105.6</ApiCompatBaselineSuffix>
     <AssemblyVersion>$(MajorVersion).$(MinorVersion).0.0</AssemblyVersion>
     <!--
         When DotNetFinalVersionKind is set to 'release', this branch will produce stable outputs for 'Shipping' packages
diff --git a/src/Libraries/Microsoft.Extensions.AI.Abstractions/Microsoft.Extensions.AI.Abstractions.csproj b/src/Libraries/Microsoft.Extensions.AI.Abstractions/Microsoft.Extensions.AI.Abstractions.csproj
index 4d7e314a0e4..f75100be60b 100644
--- a/src/Libraries/Microsoft.Extensions.AI.Abstractions/Microsoft.Extensions.AI.Abstractions.csproj
+++ b/src/Libraries/Microsoft.Extensions.AI.Abstractions/Microsoft.Extensions.AI.Abstractions.csproj
@@ -9,6 +9,7 @@
   <PropertyGroup>
     <Stage>preview</Stage>
     <SuppressFinalPackageVersion>true</SuppressFinalPackageVersion>
+    <EnablePackageValidation>false</EnablePackageValidation>
     <MinCodeCoverage>83</MinCodeCoverage>
     <MinMutationScore>0</MinMutationScore>
   </PropertyGroup>
diff --git a/src/Libraries/Microsoft.Extensions.AI.AzureAIInference/Microsoft.Extensions.AI.AzureAIInference.csproj b/src/Libraries/Microsoft.Extensions.AI.AzureAIInference/Microsoft.Extensions.AI.AzureAIInference.csproj
index b3f00b85912..44c8163d1bc 100644
--- a/src/Libraries/Microsoft.Extensions.AI.AzureAIInference/Microsoft.Extensions.AI.AzureAIInference.csproj
+++ b/src/Libraries/Microsoft.Extensions.AI.AzureAIInference/Microsoft.Extensions.AI.AzureAIInference.csproj
@@ -9,6 +9,7 @@
   <PropertyGroup>
     <Stage>preview</Stage>
     <SuppressFinalPackageVersion>true</SuppressFinalPackageVersion>
+    <EnablePackageValidation>false</EnablePackageValidation>
     <MinCodeCoverage>91</MinCodeCoverage>
     <MinMutationScore>0</MinMutationScore>
   </PropertyGroup>
diff --git a/src/Libraries/Microsoft.Extensions.AI.Ollama/Microsoft.Extensions.AI.Ollama.csproj b/src/Libraries/Microsoft.Extensions.AI.Ollama/Microsoft.Extensions.AI.Ollama.csproj
index bd7e8d27201..6cd3a1267eb 100644
--- a/src/Libraries/Microsoft.Extensions.AI.Ollama/Microsoft.Extensions.AI.Ollama.csproj
+++ b/src/Libraries/Microsoft.Extensions.AI.Ollama/Microsoft.Extensions.AI.Ollama.csproj
@@ -9,6 +9,7 @@
   <PropertyGroup>
     <Stage>preview</Stage>
     <SuppressFinalPackageVersion>true</SuppressFinalPackageVersion>
+    <EnablePackageValidation>false</EnablePackageValidation>
     <MinCodeCoverage>80</MinCodeCoverage>
     <MinMutationScore>0</MinMutationScore>
   </PropertyGroup>
diff --git a/src/Libraries/Microsoft.Extensions.AI.OpenAI/Microsoft.Extensions.AI.OpenAI.csproj b/src/Libraries/Microsoft.Extensions.AI.OpenAI/Microsoft.Extensions.AI.OpenAI.csproj
index 34541c55783..9ef1dbb833f 100644
--- a/src/Libraries/Microsoft.Extensions.AI.OpenAI/Microsoft.Extensions.AI.OpenAI.csproj
+++ b/src/Libraries/Microsoft.Extensions.AI.OpenAI/Microsoft.Extensions.AI.OpenAI.csproj
@@ -9,6 +9,7 @@
   <PropertyGroup>
     <Stage>preview</Stage>
     <SuppressFinalPackageVersion>true</SuppressFinalPackageVersion>
+    <EnablePackageValidation>false</EnablePackageValidation>
     <MinCodeCoverage>77</MinCodeCoverage>
     <MinMutationScore>0</MinMutationScore>
   </PropertyGroup>
diff --git a/src/Libraries/Microsoft.Extensions.AI/Microsoft.Extensions.AI.csproj b/src/Libraries/Microsoft.Extensions.AI/Microsoft.Extensions.AI.csproj
index 7bb57e95a3b..c0b7e149680 100644
--- a/src/Libraries/Microsoft.Extensions.AI/Microsoft.Extensions.AI.csproj
+++ b/src/Libraries/Microsoft.Extensions.AI/Microsoft.Extensions.AI.csproj
@@ -11,6 +11,7 @@
   <PropertyGroup>
     <Stage>preview</Stage>
     <SuppressFinalPackageVersion>true</SuppressFinalPackageVersion>
+    <EnablePackageValidation>false</EnablePackageValidation>
     <MinCodeCoverage>88</MinCodeCoverage>
     <MinMutationScore>0</MinMutationScore>
   </PropertyGroup>
diff --git a/src/ProjectTemplates/Directory.Build.props b/src/ProjectTemplates/Directory.Build.props
index 79a1a4c9714..2710579edee 100644
--- a/src/ProjectTemplates/Directory.Build.props
+++ b/src/ProjectTemplates/Directory.Build.props
@@ -5,5 +5,6 @@
     <NoWarn>$(NoWarn);SA1633;CS1591</NoWarn>
     <SkipAnalyzers>true</SkipAnalyzers>
     <ManagePackageVersionsCentrally>false</ManagePackageVersionsCentrally>
+    <Api>false</Api>
   </PropertyGroup>
 </Project>