.NET: [BREAKING] Change namespaces of the Microsoft.Agents.AI.OpenAI classes (#2627)

* change namespaces for agents and extension methods of the Microsoft.Agents.AI.OpenAI package

* remove unnecessary namespace

* remove unused namespaces

* fix compilation issues and rrolled back removed run methods

* sort usings

* add extension methods for AIAgent to work with OpenAI Responses primitives

* Move OpenAIChatClientAgent and OpenAIResponseClientAgent to samples

* sort usings

* sort usings

dotnet/samples/GettingStarted/A2A/A2AAgent_AsFunctionTools/Program.cs

@@ -10,7 +10,7 @@ using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/AgentProviders/Agent_With_AzureFoundryModel/Program.cs

@@ -9,6 +9,7 @@ using System.ClientModel.Primitives;
 using Azure.Identity;
 using Microsoft.Agents.AI;
 using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_FOUNDRY_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_FOUNDRY_OPENAI_ENDPOINT is not set.");
 var apiKey = Environment.GetEnvironmentVariable("AZURE_FOUNDRY_OPENAI_APIKEY");

dotnet/samples/GettingStarted/AgentProviders/Agent_With_AzureOpenAIChatCompletion/Program.cs

@@ -5,7 +5,7 @@
 using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/AgentProviders/Agent_With_AzureOpenAIResponses/Program.cs

@@ -5,7 +5,7 @@
 using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
-using OpenAI;
+using OpenAI.Responses;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/AgentProviders/Agent_With_OpenAIAssistants/Program.cs

@@ -9,6 +9,7 @@
 
 using Microsoft.Agents.AI;
 using OpenAI;
+using OpenAI.Assistants;
 
 var apiKey = Environment.GetEnvironmentVariable("OPENAI_APIKEY") ?? throw new InvalidOperationException("OPENAI_APIKEY is not set.");
 var model = Environment.GetEnvironmentVariable("OPENAI_MODEL") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/AgentProviders/Agent_With_OpenAIChatCompletion/Program.cs

@@ -5,6 +5,7 @@
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
 using OpenAI;
+using OpenAI.Chat;
 
 var apiKey = Environment.GetEnvironmentVariable("OPENAI_APIKEY") ?? throw new InvalidOperationException("OPENAI_APIKEY is not set.");
 var model = Environment.GetEnvironmentVariable("OPENAI_MODEL") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/AgentProviders/Agent_With_OpenAIResponses/Program.cs

@@ -4,6 +4,7 @@
 
 using Microsoft.Agents.AI;
 using OpenAI;
+using OpenAI.Responses;
 
 var apiKey = Environment.GetEnvironmentVariable("OPENAI_APIKEY") ?? throw new InvalidOperationException("OPENAI_APIKEY is not set.");
 var model = Environment.GetEnvironmentVariable("OPENAI_MODEL") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/AgentWithMemory/AgentWithMemory_Step01_ChatHistoryMemory/Program.cs

@@ -9,7 +9,7 @@ using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
 using Microsoft.Extensions.VectorData;
 using Microsoft.SemanticKernel.Connectors.InMemory;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/AgentWithMemory/AgentWithMemory_Step02_MemoryUsingMem0/Program.cs

@@ -11,7 +11,7 @@ using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Agents.AI.Mem0;
 using Microsoft.Extensions.AI;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/AgentWithMemory/AgentWithMemory_Step03_CustomMemory/Program.cs

@@ -12,7 +12,6 @@ using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
-using OpenAI;
 using OpenAI.Chat;
 using SampleApp;
 

dotnet/samples/GettingStarted/AgentWithOpenAI/Agent_OpenAI_Step03_CreateFromChatClient/OpenAIChatClientAgent.cs

@@ -0,0 +1,96 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.Agents.AI;
+using Microsoft.Extensions.AI;
+using Microsoft.Extensions.Logging;
+using OpenAI.Chat;
+using ChatMessage = OpenAI.Chat.ChatMessage;
+
+namespace OpenAIChatClientSample;
+
+/// <summary>
+/// Provides an <see cref="AIAgent"/> backed by an OpenAI chat completion implementation.
+/// </summary>
+public class OpenAIChatClientAgent : DelegatingAIAgent
+{
+    /// <summary>
+    /// Initialize an instance of <see cref="OpenAIChatClientAgent"/>
+    /// </summary>
+    /// <param name="client">Instance of <see cref="ChatClient"/></param>
+    /// <param name="instructions">Optional instructions for the agent.</param>
+    /// <param name="name">Optional name for the agent.</param>
+    /// <param name="description">Optional description for the agent.</param>
+    /// <param name="loggerFactory">Optional instance of <see cref="ILoggerFactory"/></param>
+    public OpenAIChatClientAgent(
+        ChatClient client,
+        string? instructions = null,
+        string? name = null,
+        string? description = null,
+        ILoggerFactory? loggerFactory = null) :
+        this(client, new()
+        {
+            Name = name,
+            Description = description,
+            ChatOptions = new ChatOptions() { Instructions = instructions },
+        }, loggerFactory)
+    {
+    }
+
+    /// <summary>
+    /// Initialize an instance of <see cref="OpenAIChatClientAgent"/>
+    /// </summary>
+    /// <param name="client">Instance of <see cref="ChatClient"/></param>
+    /// <param name="options">Options to create the agent.</param>
+    /// <param name="loggerFactory">Optional instance of <see cref="ILoggerFactory"/></param>
+    public OpenAIChatClientAgent(
+        ChatClient client, ChatClientAgentOptions options, ILoggerFactory? loggerFactory = null) :
+        base(new ChatClientAgent((client ?? throw new ArgumentNullException(nameof(client))).AsIChatClient(), options, loggerFactory))
+    {
+    }
+
+    /// <summary>
+    /// Run the agent with the provided message and arguments.
+    /// </summary>
+    /// <param name="messages">The messages to pass to the agent.</param>
+    /// <param name="thread">The conversation thread to continue with this invocation. If not provided, creates a new thread. The thread will be mutated with the provided messages and agent response.</param>
+    /// <param name="options">Optional parameters for agent invocation.</param>
+    /// <param name="cancellationToken">The <see cref="CancellationToken"/> to monitor for cancellation requests. The default is <see cref="CancellationToken.None"/>.</param>
+    /// <returns>A <see cref="ChatCompletion"/> containing the list of <see cref="ChatMessage"/> items.</returns>
+    public virtual async Task<ChatCompletion> RunAsync(
+        IEnumerable<ChatMessage> messages,
+        AgentThread? thread = null,
+        AgentRunOptions? options = null,
+        CancellationToken cancellationToken = default)
+    {
+        var response = await this.RunAsync(messages.AsChatMessages(), thread, options, cancellationToken).ConfigureAwait(false);
+
+        return response.AsOpenAIChatCompletion();
+    }
+
+    /// <summary>
+    /// Run the agent streaming with the provided message and arguments.
+    /// </summary>
+    /// <param name="messages">The messages to pass to the agent.</param>
+    /// <param name="thread">The conversation thread to continue with this invocation. If not provided, creates a new thread. The thread will be mutated with the provided messages and agent response.</param>
+    /// <param name="options">Optional parameters for agent invocation.</param>
+    /// <param name="cancellationToken">The <see cref="CancellationToken"/> to monitor for cancellation requests. The default is <see cref="CancellationToken.None"/>.</param>
+    /// <returns>A <see cref="ChatCompletion"/> containing the list of <see cref="ChatMessage"/> items.</returns>
+    public virtual IAsyncEnumerable<StreamingChatCompletionUpdate> RunStreamingAsync(
+        IEnumerable<ChatMessage> messages,
+        AgentThread? thread = null,
+        AgentRunOptions? options = null,
+        CancellationToken cancellationToken = default)
+    {
+        var response = this.RunStreamingAsync(messages.AsChatMessages(), thread, options, cancellationToken);
+
+        return response.AsChatResponseUpdatesAsync().AsOpenAIStreamingChatCompletionUpdatesAsync(cancellationToken);
+    }
+
+    /// <inheritdoc/>
+    public sealed override Task<AgentRunResponse> RunAsync(IEnumerable<Microsoft.Extensions.AI.ChatMessage> messages, AgentThread? thread = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default) =>
+        base.RunAsync(messages, thread, options, cancellationToken);
+
+    /// <inheritdoc/>
+    public override IAsyncEnumerable<AgentRunResponseUpdate> RunStreamingAsync(IEnumerable<Microsoft.Extensions.AI.ChatMessage> messages, AgentThread? thread = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default) =>
+        base.RunStreamingAsync(messages, thread, options, cancellationToken);
+}

dotnet/samples/GettingStarted/AgentWithOpenAI/Agent_OpenAI_Step03_CreateFromChatClient/Program.cs

@@ -4,6 +4,7 @@
 
 using OpenAI;
 using OpenAI.Chat;
+using OpenAIChatClientSample;
 
 string apiKey = Environment.GetEnvironmentVariable("OPENAI_API_KEY") ?? throw new InvalidOperationException("OPENAI_API_KEY is not set.");
 string model = Environment.GetEnvironmentVariable("OPENAI_MODEL") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/AgentWithOpenAI/Agent_OpenAI_Step04_CreateFromOpenAIResponseClient/OpenAIResponseClientAgent.cs

@@ -0,0 +1,114 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.Runtime.CompilerServices;
+using Microsoft.Agents.AI;
+using Microsoft.Extensions.AI;
+using Microsoft.Extensions.Logging;
+using OpenAI.Responses;
+
+namespace OpenAIResponseClientSample;
+
+/// <summary>
+/// Provides an <see cref="AIAgent"/> backed by an OpenAI Responses implementation.
+/// </summary>
+public class OpenAIResponseClientAgent : DelegatingAIAgent
+{
+    /// <summary>
+    /// Initialize an instance of <see cref="OpenAIResponseClientAgent"/>.
+    /// </summary>
+    /// <param name="client">Instance of <see cref="OpenAIResponseClient"/></param>
+    /// <param name="instructions">Optional instructions for the agent.</param>
+    /// <param name="name">Optional name for the agent.</param>
+    /// <param name="description">Optional description for the agent.</param>
+    /// <param name="loggerFactory">Optional instance of <see cref="ILoggerFactory"/></param>
+    public OpenAIResponseClientAgent(
+        OpenAIResponseClient client,
+        string? instructions = null,
+        string? name = null,
+        string? description = null,
+        ILoggerFactory? loggerFactory = null) :
+        this(client, new()
+        {
+            Name = name,
+            Description = description,
+            ChatOptions = new ChatOptions() { Instructions = instructions },
+        }, loggerFactory)
+    {
+    }
+
+    /// <summary>
+    /// Initialize an instance of <see cref="OpenAIResponseClientAgent"/>.
+    /// </summary>
+    /// <param name="client">Instance of <see cref="OpenAIResponseClient"/></param>
+    /// <param name="options">Options to create the agent.</param>
+    /// <param name="loggerFactory">Optional instance of <see cref="ILoggerFactory"/></param>
+    public OpenAIResponseClientAgent(
+        OpenAIResponseClient client, ChatClientAgentOptions options, ILoggerFactory? loggerFactory = null) :
+        base(new ChatClientAgent((client ?? throw new ArgumentNullException(nameof(client))).AsIChatClient(), options, loggerFactory))
+    {
+    }
+
+    /// <summary>
+    /// Run the agent with the provided message and arguments.
+    /// </summary>
+    /// <param name="messages">The messages to pass to the agent.</param>
+    /// <param name="thread">The conversation thread to continue with this invocation. If not provided, creates a new thread. The thread will be mutated with the provided messages and agent response.</param>
+    /// <param name="options">Optional parameters for agent invocation.</param>
+    /// <param name="cancellationToken">The <see cref="CancellationToken"/> to monitor for cancellation requests. The default is <see cref="CancellationToken.None"/>.</param>
+    /// <returns>A <see cref="OpenAIResponse"/> containing the list of <see cref="ChatMessage"/> items.</returns>
+    public virtual async Task<OpenAIResponse> RunAsync(
+        IEnumerable<ResponseItem> messages,
+        AgentThread? thread = null,
+        AgentRunOptions? options = null,
+        CancellationToken cancellationToken = default)
+    {
+        var response = await this.RunAsync(messages.AsChatMessages(), thread, options, cancellationToken).ConfigureAwait(false);
+
+        return response.AsOpenAIResponse();
+    }
+
+    /// <summary>
+    /// Run the agent streaming with the provided message and arguments.
+    /// </summary>
+    /// <param name="messages">The messages to pass to the agent.</param>
+    /// <param name="thread">The conversation thread to continue with this invocation. If not provided, creates a new thread. The thread will be mutated with the provided messages and agent response.</param>
+    /// <param name="options">Optional parameters for agent invocation.</param>
+    /// <param name="cancellationToken">The <see cref="CancellationToken"/> to monitor for cancellation requests. The default is <see cref="CancellationToken.None"/>.</param>
+    /// <returns>A <see cref="OpenAIResponse"/> containing the list of <see cref="ChatMessage"/> items.</returns>
+    public virtual async IAsyncEnumerable<StreamingResponseUpdate> RunStreamingAsync(
+        IEnumerable<ResponseItem> messages,
+        AgentThread? thread = null,
+        AgentRunOptions? options = null,
+        [EnumeratorCancellation] CancellationToken cancellationToken = default)
+    {
+        var response = this.RunStreamingAsync(messages.AsChatMessages(), thread, options, cancellationToken);
+
+        await foreach (var update in response.ConfigureAwait(false))
+        {
+            switch (update.RawRepresentation)
+            {
+                case StreamingResponseUpdate rawUpdate:
+                    yield return rawUpdate;
+                    break;
+
+                case ChatResponseUpdate { RawRepresentation: StreamingResponseUpdate rawUpdate }:
+                    yield return rawUpdate;
+                    break;
+
+                default:
+                    // TODO: The OpenAI library does not currently expose model factory methods for creating
+                    // StreamingResponseUpdates. We are thus unable to manufacture such instances when there isn't
+                    // already one in the update and instead skip them.
+                    break;
+            }
+        }
+    }
+
+    /// <inheritdoc/>
+    public sealed override Task<AgentRunResponse> RunAsync(IEnumerable<ChatMessage> messages, AgentThread? thread = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default) =>
+        base.RunAsync(messages, thread, options, cancellationToken);
+
+    /// <inheritdoc/>
+    public sealed override IAsyncEnumerable<AgentRunResponseUpdate> RunStreamingAsync(IEnumerable<ChatMessage> messages, AgentThread? thread = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default) =>
+        base.RunStreamingAsync(messages, thread, options, cancellationToken);
+}

dotnet/samples/GettingStarted/AgentWithOpenAI/Agent_OpenAI_Step04_CreateFromOpenAIResponseClient/Program.cs

@@ -4,6 +4,7 @@
 
 using OpenAI;
 using OpenAI.Responses;
+using OpenAIResponseClientSample;
 
 var apiKey = Environment.GetEnvironmentVariable("OPENAI_API_KEY") ?? throw new InvalidOperationException("OPENAI_API_KEY is not set.");
 var model = Environment.GetEnvironmentVariable("OPENAI_MODEL") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/AgentWithRAG/AgentWithRAG_Step01_BasicTextRAG/Program.cs

@@ -12,7 +12,7 @@ using Microsoft.Agents.AI.Samples;
 using Microsoft.Extensions.AI;
 using Microsoft.Extensions.VectorData;
 using Microsoft.SemanticKernel.Connectors.InMemory;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/AgentWithRAG/AgentWithRAG_Step02_CustomVectorStoreRAG/Program.cs

@@ -10,7 +10,7 @@ using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
 using Microsoft.Extensions.VectorData;
 using Microsoft.SemanticKernel.Connectors.Qdrant;
-using OpenAI;
+using OpenAI.Chat;
 using Qdrant.Client;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");

dotnet/samples/GettingStarted/AgentWithRAG/AgentWithRAG_Step03_CustomRAGDataSource/Program.cs

@@ -10,7 +10,7 @@ using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/Agents/Agent_Step01_Running/Program.cs

@@ -5,7 +5,7 @@
 using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/Agents/Agent_Step02_MultiturnConversation/Program.cs

@@ -5,7 +5,7 @@
 using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/Agents/Agent_Step03_UsingFunctionTools/Program.cs

@@ -8,7 +8,7 @@ using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/Agents/Agent_Step04_UsingFunctionToolsWithApprovals/Program.cs

@@ -10,7 +10,8 @@ using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
-using OpenAI;
+using OpenAI.Chat;
+using ChatMessage = Microsoft.Extensions.AI.ChatMessage;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/Agents/Agent_Step05_StructuredOutput/Program.cs

@@ -8,7 +8,6 @@ using System.Text.Json.Serialization;
 using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
-using OpenAI;
 using OpenAI.Chat;
 using SampleApp;
 

dotnet/samples/GettingStarted/Agents/Agent_Step06_PersistedConversations/Program.cs

@@ -6,7 +6,7 @@ using System.Text.Json;
 using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/Agents/Agent_Step07_3rdPartyThreadStorage/Program.cs

@@ -11,8 +11,9 @@ using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
 using Microsoft.Extensions.VectorData;
 using Microsoft.SemanticKernel.Connectors.InMemory;
-using OpenAI;
+using OpenAI.Chat;
 using SampleApp;
+using ChatMessage = Microsoft.Extensions.AI.ChatMessage;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/Agents/Agent_Step08_Observability/Program.cs

@@ -6,7 +6,7 @@ using Azure.AI.OpenAI;
 using Azure.Identity;
 using Azure.Monitor.OpenTelemetry.Exporter;
 using Microsoft.Agents.AI;
-using OpenAI;
+using OpenAI.Chat;
 using OpenTelemetry;
 using OpenTelemetry.Trace;
 

dotnet/samples/GettingStarted/Agents/Agent_Step11_UsingImages/Program.cs

@@ -5,7 +5,8 @@
 using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Extensions.AI;
-using OpenAI;
+using OpenAI.Chat;
+using ChatMessage = Microsoft.Extensions.AI.ChatMessage;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = System.Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o";

dotnet/samples/GettingStarted/Agents/Agent_Step12_AsFunctionTool/Program.cs

@@ -7,7 +7,7 @@ using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/Agents/Agent_Step13_BackgroundResponsesWithToolsAndPersistence/Program.cs

@@ -12,7 +12,7 @@ using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
-using OpenAI;
+using OpenAI.Responses;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-5";

dotnet/samples/GettingStarted/Agents/Agent_Step15_Plugins/Program.cs

@@ -14,7 +14,7 @@ using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
 using Microsoft.Extensions.DependencyInjection;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/Agents/Agent_Step16_ChatReduction/Program.cs

@@ -9,7 +9,8 @@ using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
-using OpenAI;
+using OpenAI.Chat;
+using ChatMessage = Microsoft.Extensions.AI.ChatMessage;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/Agents/Agent_Step17_BackgroundResponses/Program.cs

@@ -5,7 +5,7 @@
 using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
-using OpenAI;
+using OpenAI.Responses;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/ModelContextProtocol/Agent_MCP_Server/Program.cs

@@ -7,7 +7,7 @@ using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
 using ModelContextProtocol.Client;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/ModelContextProtocol/Agent_MCP_Server_Auth/Program.cs

@@ -11,7 +11,7 @@ using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.Logging;
 using ModelContextProtocol.Client;
-using OpenAI;
+using OpenAI.Chat;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

dotnet/samples/GettingStarted/ModelContextProtocol/ResponseAgent_Hosted_MCP/Program.cs

@@ -8,7 +8,7 @@ using Azure.AI.OpenAI;
 using Azure.Identity;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.AI;
-using OpenAI;
+using OpenAI.Responses;
 
 var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
 var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";