diff --git a/src/Libraries/Microsoft.Extensions.AI/ChatCompletion/ChatClientBuilderServiceCollectionExtensions.cs b/src/Libraries/Microsoft.Extensions.AI/ChatCompletion/ChatClientBuilderServiceCollectionExtensions.cs
index c3d8ab88edb..68c7c6f2cea 100644
--- a/src/Libraries/Microsoft.Extensions.AI/ChatCompletion/ChatClientBuilderServiceCollectionExtensions.cs
+++ b/src/Libraries/Microsoft.Extensions.AI/ChatCompletion/ChatClientBuilderServiceCollectionExtensions.cs
@@ -13,27 +13,31 @@ public static class ChatClientBuilderServiceCollectionExtensions
     /// <summary>Registers a singleton <see cref="IChatClient"/> in the <see cref="IServiceCollection"/>.</summary>
     /// <param name="serviceCollection">The <see cref="IServiceCollection"/> to which the client should be added.</param>
     /// <param name="innerClient">The inner <see cref="IChatClient"/> that represents the underlying backend.</param>
+    /// <param name="lifetime">The service lifetime for the client. Defaults to <see cref="ServiceLifetime.Singleton"/>.</param>
     /// <returns>A <see cref="ChatClientBuilder"/> that can be used to build a pipeline around the inner client.</returns>
     /// <remarks>The client is registered as a singleton service.</remarks>
     public static ChatClientBuilder AddChatClient(
         this IServiceCollection serviceCollection,
-        IChatClient innerClient)
-        => AddChatClient(serviceCollection, _ => innerClient);
+        IChatClient innerClient,
+        ServiceLifetime lifetime = ServiceLifetime.Singleton)
+        => AddChatClient(serviceCollection, _ => innerClient, lifetime);
 
     /// <summary>Registers a singleton <see cref="IChatClient"/> in the <see cref="IServiceCollection"/>.</summary>
     /// <param name="serviceCollection">The <see cref="IServiceCollection"/> to which the client should be added.</param>
     /// <param name="innerClientFactory">A callback that produces the inner <see cref="IChatClient"/> that represents the underlying backend.</param>
+    /// <param name="lifetime">The service lifetime for the client. Defaults to <see cref="ServiceLifetime.Singleton"/>.</param>
     /// <returns>A <see cref="ChatClientBuilder"/> that can be used to build a pipeline around the inner client.</returns>
     /// <remarks>The client is registered as a singleton service.</remarks>
     public static ChatClientBuilder AddChatClient(
         this IServiceCollection serviceCollection,
-        Func<IServiceProvider, IChatClient> innerClientFactory)
+        Func<IServiceProvider, IChatClient> innerClientFactory,
+        ServiceLifetime lifetime = ServiceLifetime.Singleton)
     {
         _ = Throw.IfNull(serviceCollection);
         _ = Throw.IfNull(innerClientFactory);
 
         var builder = new ChatClientBuilder(innerClientFactory);
-        _ = serviceCollection.AddSingleton(builder.Build);
+        serviceCollection.Add(new ServiceDescriptor(typeof(IChatClient), builder.Build, lifetime));
         return builder;
     }
 
@@ -41,31 +45,35 @@ public static ChatClientBuilder AddChatClient(
     /// <param name="serviceCollection">The <see cref="IServiceCollection"/> to which the client should be added.</param>
     /// <param name="serviceKey">The key with which to associate the client.</param>
     /// <param name="innerClient">The inner <see cref="IChatClient"/> that represents the underlying backend.</param>
+    /// <param name="lifetime">The service lifetime for the client. Defaults to <see cref="ServiceLifetime.Singleton"/>.</param>
     /// <returns>A <see cref="ChatClientBuilder"/> that can be used to build a pipeline around the inner client.</returns>
     /// <remarks>The client is registered as a scoped service.</remarks>
     public static ChatClientBuilder AddKeyedChatClient(
         this IServiceCollection serviceCollection,
         object serviceKey,
-        IChatClient innerClient)
-        => AddKeyedChatClient(serviceCollection, serviceKey, _ => innerClient);
+        IChatClient innerClient,
+        ServiceLifetime lifetime = ServiceLifetime.Singleton)
+        => AddKeyedChatClient(serviceCollection, serviceKey, _ => innerClient, lifetime);
 
     /// <summary>Registers a keyed singleton <see cref="IChatClient"/> in the <see cref="IServiceCollection"/>.</summary>
     /// <param name="serviceCollection">The <see cref="IServiceCollection"/> to which the client should be added.</param>
     /// <param name="serviceKey">The key with which to associate the client.</param>
     /// <param name="innerClientFactory">A callback that produces the inner <see cref="IChatClient"/> that represents the underlying backend.</param>
+    /// <param name="lifetime">The service lifetime for the client. Defaults to <see cref="ServiceLifetime.Singleton"/>.</param>
     /// <returns>A <see cref="ChatClientBuilder"/> that can be used to build a pipeline around the inner client.</returns>
     /// <remarks>The client is registered as a scoped service.</remarks>
     public static ChatClientBuilder AddKeyedChatClient(
         this IServiceCollection serviceCollection,
         object serviceKey,
-        Func<IServiceProvider, IChatClient> innerClientFactory)
+        Func<IServiceProvider, IChatClient> innerClientFactory,
+        ServiceLifetime lifetime = ServiceLifetime.Singleton)
     {
         _ = Throw.IfNull(serviceCollection);
         _ = Throw.IfNull(serviceKey);
         _ = Throw.IfNull(innerClientFactory);
 
         var builder = new ChatClientBuilder(innerClientFactory);
-        _ = serviceCollection.AddKeyedSingleton(serviceKey, (services, _) => builder.Build(services));
+        serviceCollection.Add(new ServiceDescriptor(typeof(IChatClient), serviceKey, factory: (services, serviceKey) => builder.Build(services), lifetime));
         return builder;
     }
 }
diff --git a/src/Libraries/Microsoft.Extensions.AI/Embeddings/EmbeddingGeneratorBuilderServiceCollectionExtensions.cs b/src/Libraries/Microsoft.Extensions.AI/Embeddings/EmbeddingGeneratorBuilderServiceCollectionExtensions.cs
index 1c57fb08215..b35fcd7f4ff 100644
--- a/src/Libraries/Microsoft.Extensions.AI/Embeddings/EmbeddingGeneratorBuilderServiceCollectionExtensions.cs
+++ b/src/Libraries/Microsoft.Extensions.AI/Embeddings/EmbeddingGeneratorBuilderServiceCollectionExtensions.cs
@@ -15,31 +15,35 @@ public static class EmbeddingGeneratorBuilderServiceCollectionExtensions
     /// <typeparam name="TEmbedding">The type of embeddings to generate.</typeparam>
     /// <param name="serviceCollection">The <see cref="IServiceCollection"/> to which the generator should be added.</param>
     /// <param name="innerGenerator">The inner <see cref="IEmbeddingGenerator{TInput, TEmbedding}"/> that represents the underlying backend.</param>
+    /// <param name="lifetime">The service lifetime for the client. Defaults to <see cref="ServiceLifetime.Singleton"/>.</param>
     /// <returns>An <see cref="EmbeddingGeneratorBuilder{TInput, TEmbedding}"/> that can be used to build a pipeline around the inner generator.</returns>
     /// <remarks>The generator is registered as a singleton service.</remarks>
     public static EmbeddingGeneratorBuilder<TInput, TEmbedding> AddEmbeddingGenerator<TInput, TEmbedding>(
         this IServiceCollection serviceCollection,
-        IEmbeddingGenerator<TInput, TEmbedding> innerGenerator)
+        IEmbeddingGenerator<TInput, TEmbedding> innerGenerator,
+        ServiceLifetime lifetime = ServiceLifetime.Singleton)
         where TEmbedding : Embedding
-        => AddEmbeddingGenerator(serviceCollection, _ => innerGenerator);
+        => AddEmbeddingGenerator(serviceCollection, _ => innerGenerator, lifetime);
 
     /// <summary>Registers a singleton embedding generator in the <see cref="IServiceCollection"/>.</summary>
     /// <typeparam name="TInput">The type from which embeddings will be generated.</typeparam>
     /// <typeparam name="TEmbedding">The type of embeddings to generate.</typeparam>
     /// <param name="serviceCollection">The <see cref="IServiceCollection"/> to which the generator should be added.</param>
     /// <param name="innerGeneratorFactory">A callback that produces the inner <see cref="IEmbeddingGenerator{TInput, TEmbedding}"/> that represents the underlying backend.</param>
+    /// <param name="lifetime">The service lifetime for the client. Defaults to <see cref="ServiceLifetime.Singleton"/>.</param>
     /// <returns>An <see cref="EmbeddingGeneratorBuilder{TInput, TEmbedding}"/> that can be used to build a pipeline around the inner generator.</returns>
     /// <remarks>The generator is registered as a singleton service.</remarks>
     public static EmbeddingGeneratorBuilder<TInput, TEmbedding> AddEmbeddingGenerator<TInput, TEmbedding>(
         this IServiceCollection serviceCollection,
-        Func<IServiceProvider, IEmbeddingGenerator<TInput, TEmbedding>> innerGeneratorFactory)
+        Func<IServiceProvider, IEmbeddingGenerator<TInput, TEmbedding>> innerGeneratorFactory,
+        ServiceLifetime lifetime = ServiceLifetime.Singleton)
         where TEmbedding : Embedding
     {
         _ = Throw.IfNull(serviceCollection);
         _ = Throw.IfNull(innerGeneratorFactory);
 
         var builder = new EmbeddingGeneratorBuilder<TInput, TEmbedding>(innerGeneratorFactory);
-        _ = serviceCollection.AddSingleton(builder.Build);
+        serviceCollection.Add(new ServiceDescriptor(typeof(IEmbeddingGenerator<TInput, TEmbedding>), builder.Build, lifetime));
         return builder;
     }
 
@@ -49,14 +53,16 @@ public static EmbeddingGeneratorBuilder<TInput, TEmbedding> AddEmbeddingGenerato
     /// <param name="serviceCollection">The <see cref="IServiceCollection"/> to which the generator should be added.</param>
     /// <param name="serviceKey">The key with which to associated the generator.</param>
     /// <param name="innerGenerator">The inner <see cref="IEmbeddingGenerator{TInput, TEmbedding}"/> that represents the underlying backend.</param>
+    /// <param name="lifetime">The service lifetime for the client. Defaults to <see cref="ServiceLifetime.Singleton"/>.</param>
     /// <returns>An <see cref="EmbeddingGeneratorBuilder{TInput, TEmbedding}"/> that can be used to build a pipeline around the inner generator.</returns>
     /// <remarks>The generator is registered as a singleton service.</remarks>
     public static EmbeddingGeneratorBuilder<TInput, TEmbedding> AddKeyedEmbeddingGenerator<TInput, TEmbedding>(
         this IServiceCollection serviceCollection,
         object serviceKey,
-        IEmbeddingGenerator<TInput, TEmbedding> innerGenerator)
+        IEmbeddingGenerator<TInput, TEmbedding> innerGenerator,
+        ServiceLifetime lifetime = ServiceLifetime.Singleton)
         where TEmbedding : Embedding
-        => AddKeyedEmbeddingGenerator(serviceCollection, serviceKey, _ => innerGenerator);
+        => AddKeyedEmbeddingGenerator(serviceCollection, serviceKey, _ => innerGenerator, lifetime);
 
     /// <summary>Registers a keyed singleton embedding generator in the <see cref="IServiceCollection"/>.</summary>
     /// <typeparam name="TInput">The type from which embeddings will be generated.</typeparam>
@@ -64,12 +70,14 @@ public static EmbeddingGeneratorBuilder<TInput, TEmbedding> AddKeyedEmbeddingGen
     /// <param name="serviceCollection">The <see cref="IServiceCollection"/> to which the generator should be added.</param>
     /// <param name="serviceKey">The key with which to associated the generator.</param>
     /// <param name="innerGeneratorFactory">A callback that produces the inner <see cref="IEmbeddingGenerator{TInput, TEmbedding}"/> that represents the underlying backend.</param>
+    /// <param name="lifetime">The service lifetime for the client. Defaults to <see cref="ServiceLifetime.Singleton"/>.</param>
     /// <returns>An <see cref="EmbeddingGeneratorBuilder{TInput, TEmbedding}"/> that can be used to build a pipeline around the inner generator.</returns>
     /// <remarks>The generator is registered as a singleton service.</remarks>
     public static EmbeddingGeneratorBuilder<TInput, TEmbedding> AddKeyedEmbeddingGenerator<TInput, TEmbedding>(
         this IServiceCollection serviceCollection,
         object serviceKey,
-        Func<IServiceProvider, IEmbeddingGenerator<TInput, TEmbedding>> innerGeneratorFactory)
+        Func<IServiceProvider, IEmbeddingGenerator<TInput, TEmbedding>> innerGeneratorFactory,
+        ServiceLifetime lifetime = ServiceLifetime.Singleton)
         where TEmbedding : Embedding
     {
         _ = Throw.IfNull(serviceCollection);
@@ -77,7 +85,7 @@ public static EmbeddingGeneratorBuilder<TInput, TEmbedding> AddKeyedEmbeddingGen
         _ = Throw.IfNull(innerGeneratorFactory);
 
         var builder = new EmbeddingGeneratorBuilder<TInput, TEmbedding>(innerGeneratorFactory);
-        _ = serviceCollection.AddKeyedSingleton(serviceKey, (services, _) => builder.Build(services));
+        serviceCollection.Add(new ServiceDescriptor(typeof(IEmbeddingGenerator<TInput, TEmbedding>), serviceKey, factory: (services, serviceKey) => builder.Build(services), lifetime));
         return builder;
     }
 }
diff --git a/test/Libraries/Microsoft.Extensions.AI.Tests/ChatCompletion/DependencyInjectionPatterns.cs b/test/Libraries/Microsoft.Extensions.AI.Tests/ChatCompletion/DependencyInjectionPatterns.cs
index c99d4511f75..c2f288165cb 100644
--- a/test/Libraries/Microsoft.Extensions.AI.Tests/ChatCompletion/DependencyInjectionPatterns.cs
+++ b/test/Libraries/Microsoft.Extensions.AI.Tests/ChatCompletion/DependencyInjectionPatterns.cs
@@ -109,6 +109,96 @@ public void CanRegisterKeyedSingletonUsingSharedInstance()
         Assert.IsType<TestChatClient>(instance.InnerClient);
     }
 
+    [Theory]
+    [InlineData(null)]
+    [InlineData(ServiceLifetime.Singleton)]
+    [InlineData(ServiceLifetime.Scoped)]
+    [InlineData(ServiceLifetime.Transient)]
+    public void AddChatClient_RegistersExpectedLifetime(ServiceLifetime? lifetime)
+    {
+        ServiceCollection sc = new();
+        ServiceLifetime expectedLifetime = lifetime ?? ServiceLifetime.Singleton;
+        ChatClientBuilder builder = lifetime.HasValue
+            ? sc.AddChatClient(services => new TestChatClient(), lifetime.Value)
+            : sc.AddChatClient(services => new TestChatClient());
+
+        ServiceDescriptor sd = Assert.Single(sc);
+        Assert.Equal(typeof(IChatClient), sd.ServiceType);
+        Assert.False(sd.IsKeyedService);
+        Assert.Null(sd.ImplementationInstance);
+        Assert.NotNull(sd.ImplementationFactory);
+        Assert.IsType<TestChatClient>(sd.ImplementationFactory(null!));
+        Assert.Equal(expectedLifetime, sd.Lifetime);
+    }
+
+    [Theory]
+    [InlineData(null)]
+    [InlineData(ServiceLifetime.Singleton)]
+    [InlineData(ServiceLifetime.Scoped)]
+    [InlineData(ServiceLifetime.Transient)]
+    public void AddKeyedChatClient_RegistersExpectedLifetime(ServiceLifetime? lifetime)
+    {
+        ServiceCollection sc = new();
+        ServiceLifetime expectedLifetime = lifetime ?? ServiceLifetime.Singleton;
+        ChatClientBuilder builder = lifetime.HasValue
+            ? sc.AddKeyedChatClient("key", services => new TestChatClient(), lifetime.Value)
+            : sc.AddKeyedChatClient("key", services => new TestChatClient());
+
+        ServiceDescriptor sd = Assert.Single(sc);
+        Assert.Equal(typeof(IChatClient), sd.ServiceType);
+        Assert.True(sd.IsKeyedService);
+        Assert.Equal("key", sd.ServiceKey);
+        Assert.Null(sd.KeyedImplementationInstance);
+        Assert.NotNull(sd.KeyedImplementationFactory);
+        Assert.IsType<TestChatClient>(sd.KeyedImplementationFactory(null!, null!));
+        Assert.Equal(expectedLifetime, sd.Lifetime);
+    }
+
+    [Theory]
+    [InlineData(null)]
+    [InlineData(ServiceLifetime.Singleton)]
+    [InlineData(ServiceLifetime.Scoped)]
+    [InlineData(ServiceLifetime.Transient)]
+    public void AddEmbeddingGenerator_RegistersExpectedLifetime(ServiceLifetime? lifetime)
+    {
+        ServiceCollection sc = new();
+        ServiceLifetime expectedLifetime = lifetime ?? ServiceLifetime.Singleton;
+        var builder = lifetime.HasValue
+            ? sc.AddEmbeddingGenerator(services => new TestEmbeddingGenerator(), lifetime.Value)
+            : sc.AddEmbeddingGenerator(services => new TestEmbeddingGenerator());
+
+        ServiceDescriptor sd = Assert.Single(sc);
+        Assert.Equal(typeof(IEmbeddingGenerator<string, Embedding<float>>), sd.ServiceType);
+        Assert.False(sd.IsKeyedService);
+        Assert.Null(sd.ImplementationInstance);
+        Assert.NotNull(sd.ImplementationFactory);
+        Assert.IsType<TestEmbeddingGenerator>(sd.ImplementationFactory(null!));
+        Assert.Equal(expectedLifetime, sd.Lifetime);
+    }
+
+    [Theory]
+    [InlineData(null)]
+    [InlineData(ServiceLifetime.Singleton)]
+    [InlineData(ServiceLifetime.Scoped)]
+    [InlineData(ServiceLifetime.Transient)]
+    public void AddKeyedEmbeddingGenerator_RegistersExpectedLifetime(ServiceLifetime? lifetime)
+    {
+        ServiceCollection sc = new();
+        ServiceLifetime expectedLifetime = lifetime ?? ServiceLifetime.Singleton;
+        var builder = lifetime.HasValue
+            ? sc.AddKeyedEmbeddingGenerator("key", services => new TestEmbeddingGenerator(), lifetime.Value)
+            : sc.AddKeyedEmbeddingGenerator("key", services => new TestEmbeddingGenerator());
+
+        ServiceDescriptor sd = Assert.Single(sc);
+        Assert.Equal(typeof(IEmbeddingGenerator<string, Embedding<float>>), sd.ServiceType);
+        Assert.True(sd.IsKeyedService);
+        Assert.Equal("key", sd.ServiceKey);
+        Assert.Null(sd.KeyedImplementationInstance);
+        Assert.NotNull(sd.KeyedImplementationFactory);
+        Assert.IsType<TestEmbeddingGenerator>(sd.KeyedImplementationFactory(null!, null!));
+        Assert.Equal(expectedLifetime, sd.Lifetime);
+    }
+
     public class SingletonMiddleware(IChatClient inner, IServiceProvider services) : DelegatingChatClient(inner)
     {
         public new IChatClient InnerClient => base.InnerClient;