diff --git a/Directory.Packages.props b/Directory.Packages.props
index d1e451a..9242c18 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -59,7 +59,7 @@
 
   <!-- Testing dependencies -->
   <ItemGroup>
-    <PackageVersion Include="Anthropic.SDK" Version="5.8.0" />
+    <PackageVersion Include="Anthropic" Version="11.0.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.4">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
diff --git a/samples/ChatWithTools/ChatWithTools.csproj b/samples/ChatWithTools/ChatWithTools.csproj
index 481b86f..3723185 100644
--- a/samples/ChatWithTools/ChatWithTools.csproj
+++ b/samples/ChatWithTools/ChatWithTools.csproj
@@ -14,7 +14,6 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.AI" />
     <PackageReference Include="Microsoft.Extensions.AI.OpenAI" />
-    <PackageReference Include="Anthropic.SDK" />
     <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" />
     <PackageReference Include="OpenTelemetry.Instrumentation.Http" />
   </ItemGroup>
diff --git a/samples/QuickstartClient/Program.cs b/samples/QuickstartClient/Program.cs
index 598f883..23bc4c1 100644
--- a/samples/QuickstartClient/Program.cs
+++ b/samples/QuickstartClient/Program.cs
@@ -1,4 +1,4 @@
-using Anthropic.SDK;
+using Anthropic;
 using Microsoft.Extensions.AI;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Hosting;
@@ -41,8 +41,8 @@ foreach (var tool in tools)
     Console.WriteLine($"Connected to server with tools: {tool.Name}");
 }
 
-using var anthropicClient = new AnthropicClient(new APIAuthentication(builder.Configuration["ANTHROPIC_API_KEY"]))
-    .Messages
+using var anthropicClient = new AnthropicClient(new() { APIKey = builder.Configuration["ANTHROPIC_API_KEY"] })
+    .AsIChatClient("claude-haiku-4-5-20251001")
     .AsBuilder()
     .UseFunctionInvocation()
     .Build();
diff --git a/samples/QuickstartClient/QuickstartClient.csproj b/samples/QuickstartClient/QuickstartClient.csproj
index 3b23310..9af83fb 100644
--- a/samples/QuickstartClient/QuickstartClient.csproj
+++ b/samples/QuickstartClient/QuickstartClient.csproj
@@ -17,7 +17,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="Anthropic.SDK" />
+        <PackageReference Include="Anthropic" />
         <PackageReference Include="Microsoft.Extensions.Hosting" />
         <PackageReference Include="Microsoft.Extensions.AI" />
     </ItemGroup>