diff --git a/Geesemon.Web/Commands/CommandAttribute.cs b/Geesemon.Web/Commands/CommandAttribute.cs
new file mode 100644
index 0000000..b290ea0
--- /dev/null
+++ b/Geesemon.Web/Commands/CommandAttribute.cs
@@ -0,0 +1,7 @@
+namespace Geesemon.Web.Commands;
+
+[AttributeUsage(AttributeTargets.Method)]
+public class CommandAttribute(string command) : Attribute
+{
+    public string Command => command;
+}
diff --git a/Geesemon.Web/Commands/CommandContext.cs b/Geesemon.Web/Commands/CommandContext.cs
new file mode 100644
index 0000000..edc99d9
--- /dev/null
+++ b/Geesemon.Web/Commands/CommandContext.cs
@@ -0,0 +1,6 @@
+namespace Geesemon.Web.Commands;
+
+public readonly record struct CommandContext(
+    string Message,
+    Guid FromId,
+    Guid ChatId);
diff --git a/Geesemon.Web/Commands/CommandExecutor.cs b/Geesemon.Web/Commands/CommandExecutor.cs
new file mode 100644
index 0000000..36b8903
--- /dev/null
+++ b/Geesemon.Web/Commands/CommandExecutor.cs
@@ -0,0 +1,52 @@
+using System.Reflection;
+
+namespace Geesemon.Web.Commands;
+
+public class CommandExecutor
+{
+    readonly List<CommandInfo> commandInfos = [];
+
+    public CommandExecutor(IEnumerable<ICommandModule> commandModules)
+    {
+        foreach (var module in commandModules)
+        {
+            var commandInfos = module
+                .GetType()
+                .GetMethods()
+                .Select(commandMethod =>
+                {
+                    var command = commandMethod.GetCustomAttributes<CommandAttribute>(inherit: false).FirstOrDefault()?.Command;
+                    return new CommandInfo(module, commandMethod, command);
+                })
+                .Where(i => !string.IsNullOrWhiteSpace(i.Command));
+
+            this.commandInfos.AddRange(commandInfos);
+        }
+    }
+
+    public async Task Execute(CommandContext context)
+    {
+        foreach (var commandInfo in commandInfos)
+        {
+            if (context.Message == commandInfo.Command)
+            {
+                await (Task)commandInfo.CommandMethod.Invoke(commandInfo.Module, [context]);
+                return;
+            }
+
+            var command = commandInfo.Command + " ";
+
+            if (context.Message.StartsWith(command))
+            {
+                var message = context.Message[command.Length..];
+
+                context = context with { Message = message };
+
+                await (Task)commandInfo.CommandMethod.Invoke(commandInfo.Module, [context]);
+                return;
+            }
+        }
+    }
+}
+
+readonly record struct CommandInfo(ICommandModule Module, MethodInfo CommandMethod, string Command);
diff --git a/Geesemon.Web/Commands/ICommandModule.cs b/Geesemon.Web/Commands/ICommandModule.cs
new file mode 100644
index 0000000..f417d13
--- /dev/null
+++ b/Geesemon.Web/Commands/ICommandModule.cs
@@ -0,0 +1,5 @@
+namespace Geesemon.Web.Commands;
+
+public interface ICommandModule
+{
+}
diff --git a/Geesemon.Web/Commands/Modules/ChatGptModule.cs b/Geesemon.Web/Commands/Modules/ChatGptModule.cs
new file mode 100644
index 0000000..571a965
--- /dev/null
+++ b/Geesemon.Web/Commands/Modules/ChatGptModule.cs
@@ -0,0 +1,49 @@
+using Geesemon.DataAccess.Dapper.Providers;
+using Geesemon.Model.Models;
+using Geesemon.Web.Services.MessageSubscription;
+using Geesemon.Web.Utils.SettingsAccess;
+
+using OpenAI_API;
+
+namespace Geesemon.Web.Commands.Modules;
+
+public class ChatGptModule(
+    ISettingsProvider settingsProvider,
+    MessageProvider messageProvider,
+    IMessageActionSubscriptionService messageActionSubscriptionService)
+    : ICommandModule
+{
+    readonly MessageProvider messageProvider = messageProvider;
+    readonly IMessageActionSubscriptionService messageActionSubscriptionService = messageActionSubscriptionService;
+    readonly OpenAIAPI chatGpt = new OpenAIAPI(settingsProvider.GetChatGptApiKey());
+
+    [Command("/ai")]
+    public async Task Ai(CommandContext context)
+    {
+        var conversation = chatGpt.Chat.CreateConversation();
+
+        conversation.AppendUserInput(context.Message);
+
+        Message? message = null;
+        await foreach (var messagePart in conversation.StreamResponseEnumerableFromChatbotAsync())
+        {
+            if (message == null)
+            {
+                message = new Message
+                {
+                    ChatId = context.ChatId,
+                    Text = messagePart,
+                    FromId = context.FromId,
+                };
+
+                message = await messageProvider.CreateAsync(message);
+                messageActionSubscriptionService.Notify(message, MessageActionKind.Create);
+                continue;
+            }
+
+            message.Text += messagePart;
+            message = await messageProvider.UpdateAsync(message);
+            messageActionSubscriptionService.Notify(message, MessageActionKind.Update);
+        }
+    }
+}
diff --git a/Geesemon.Web/Extensions/ServiceCollectionExtensions.cs b/Geesemon.Web/Extensions/ServiceCollectionExtensions.cs
index 547eddf..b508c01 100644
--- a/Geesemon.Web/Extensions/ServiceCollectionExtensions.cs
+++ b/Geesemon.Web/Extensions/ServiceCollectionExtensions.cs
@@ -2,6 +2,7 @@
 
 using Geesemon.Migrations;
 using Geesemon.Model.Enums;
+using Geesemon.Web.Commands;
 using Geesemon.Web.Geesetext;
 using Geesemon.Web.GraphQL;
 using Geesemon.Web.GraphQL.Auth;
@@ -108,5 +109,21 @@ public static IServiceCollection AddServices(this IServiceCollection services, I
 
             return services;
         }
+
+        public static IServiceCollection AddCommandModules(this IServiceCollection services)
+        {
+            var commandModuleType = typeof(ICommandModule);
+
+            var commandModules = AppDomain.CurrentDomain.GetAssemblies()
+                .SelectMany(a => a.GetTypes())
+                .Where(t => t.GetInterfaces().Contains(commandModuleType));
+
+            foreach (var commandModule in commandModules)
+                services.AddSingleton(commandModuleType, commandModule);
+
+            services.AddSingleton<CommandExecutor>();
+
+            return services;
+        }
     }
 }
diff --git a/Geesemon.Web/Geesemon.Web.csproj b/Geesemon.Web/Geesemon.Web.csproj
index 6a148b3..dce1805 100644
--- a/Geesemon.Web/Geesemon.Web.csproj
+++ b/Geesemon.Web/Geesemon.Web.csproj
@@ -49,6 +49,7 @@
 		  <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 		</PackageReference>
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+		<PackageReference Include="OpenAI" Version="1.11.0" />
 	</ItemGroup>
 
   <ItemGroup>
diff --git a/Geesemon.Web/GraphQL/Mutations/MessageMutation.cs b/Geesemon.Web/GraphQL/Mutations/MessageMutation.cs
index 8a94233..ca558e1 100644
--- a/Geesemon.Web/GraphQL/Mutations/MessageMutation.cs
+++ b/Geesemon.Web/GraphQL/Mutations/MessageMutation.cs
@@ -4,6 +4,7 @@
 using Geesemon.DataAccess.Managers;
 using Geesemon.Model.Common;
 using Geesemon.Model.Models;
+using Geesemon.Web.Commands;
 using Geesemon.Web.GraphQL.Auth;
 using Geesemon.Web.GraphQL.Types;
 using Geesemon.Web.Services.FileManagers;
@@ -24,7 +25,8 @@ public MessageMutation(
             ReadMessagesManager readMessagesManager,
             IValidator<SentMessageInput> sentMessageInputValidator,
             IValidator<DeleteMessageInput> deleteMessageInputValidator,
-            IFileManagerService fileManagerService
+            IFileManagerService fileManagerService,
+            CommandExecutor commandExecutor
             )
         {
             Field<NonNullGraphType<ListGraphType<MessageType>>, IEnumerable<Message>>()
@@ -122,8 +124,9 @@ IFileManagerService fileManagerService
                         createdMessages.Add(createdMessage);
                     }
 
-                    return createdMessages;
+                    await commandExecutor.Execute(new(sentMessageInput.Text, currentUserId, chat.Id));
 
+                    return createdMessages;
                 })
                 .AuthorizeWith(AuthPolicies.Authenticated);
 
diff --git a/Geesemon.Web/Program.cs b/Geesemon.Web/Program.cs
index c1de3b5..0ce88d3 100644
--- a/Geesemon.Web/Program.cs
+++ b/Geesemon.Web/Program.cs
@@ -3,10 +3,12 @@
 using Geesemon.Migrations.Extensions;
 using Geesemon.Web.Extensions;
 using Geesemon.Web.GraphQL;
+
 using Microsoft.Extensions.FileProviders;
 
 var builder = WebApplication.CreateBuilder(args);
 builder.Services.AddServices(builder.Configuration);
+builder.Services.AddCommandModules();
 builder.Services.AddMigrationServices(builder.Configuration);
 
 var connectionString = builder.Configuration.GetValue<string>("ConnectionString");
diff --git a/Geesemon.Web/Utils/SettingsAccess/AppSettingsProvider.cs b/Geesemon.Web/Utils/SettingsAccess/AppSettingsProvider.cs
index eab485a..6ca0e64 100644
--- a/Geesemon.Web/Utils/SettingsAccess/AppSettingsProvider.cs
+++ b/Geesemon.Web/Utils/SettingsAccess/AppSettingsProvider.cs
@@ -43,5 +43,10 @@ public FileProvider GetFileProvider()
         {
             return configuration.GetValue<FileProvider>("FileProvider");
         }
+
+        public string GetChatGptApiKey()
+        {
+            return configuration.GetValue<string>("ChatGptApiKey");
+        }
     }
 }
diff --git a/Geesemon.Web/Utils/SettingsAccess/EnvironmentSettingsProvider.cs b/Geesemon.Web/Utils/SettingsAccess/EnvironmentSettingsProvider.cs
index f1e7c68..4050685 100644
--- a/Geesemon.Web/Utils/SettingsAccess/EnvironmentSettingsProvider.cs
+++ b/Geesemon.Web/Utils/SettingsAccess/EnvironmentSettingsProvider.cs
@@ -36,5 +36,10 @@ public FileProvider GetFileProvider()
         {
             return Enum.Parse<FileProvider>(Environment.GetEnvironmentVariable("FileProvider"));
         }
+
+        public string GetChatGptApiKey()
+        {
+            return Environment.GetEnvironmentVariable("ChatGptApiKey");
+        }
     }
 }
diff --git a/Geesemon.Web/Utils/SettingsAccess/ISettingsProvider.cs b/Geesemon.Web/Utils/SettingsAccess/ISettingsProvider.cs
index e878ef4..ac1f014 100644
--- a/Geesemon.Web/Utils/SettingsAccess/ISettingsProvider.cs
+++ b/Geesemon.Web/Utils/SettingsAccess/ISettingsProvider.cs
@@ -15,5 +15,7 @@ public interface ISettingsProvider
         string GetBlobConnectionString();
 
         FileProvider GetFileProvider();
+
+        string GetChatGptApiKey();
     }
 }
\ No newline at end of file