diff --git a/src/Infrastructure/BotSharp.Abstraction/Models/Gpt4xModelConstants.cs b/src/Infrastructure/BotSharp.Abstraction/Models/Gpt4xModelConstants.cs
index 2de7a7e68..31c0f3267 100644
--- a/src/Infrastructure/BotSharp.Abstraction/Models/Gpt4xModelConstants.cs
+++ b/src/Infrastructure/BotSharp.Abstraction/Models/Gpt4xModelConstants.cs
@@ -10,4 +10,9 @@ public static class Gpt4xModelConstants
     public const string GPT_4_1_Nano = "gpt-4.1-nano";
     public const string GPT_4o_Mini_Realtime_Preview = "gpt-4o-mini-realtime-preview";
     public const string GPT_4o_Realtime_Preview = "gpt-4o-realtime-preview";
+    public const string GPT_4o_Mini_Search_Preview = "gpt-4o-mini-search-preview";
+    public const string GPT_4o_Mini_Transcribe = "gpt-4o-mini-transcribe";
+    public const string GPT_4o_Transcribe = "gpt-4o-transcribe";
+    public const string GPT_4o_Mini_Tts = "gpt-4o-mini-tts";
+    public const string GPT_4o_Search_Preview = "gpt-4o-search-preview";
 }
diff --git a/src/Infrastructure/BotSharp.Abstraction/Realtime/Models/ModelTurnDetection.cs b/src/Infrastructure/BotSharp.Abstraction/Realtime/Models/ModelTurnDetection.cs
index 3a57791e6..0fa48cdaa 100644
--- a/src/Infrastructure/BotSharp.Abstraction/Realtime/Models/ModelTurnDetection.cs
+++ b/src/Infrastructure/BotSharp.Abstraction/Realtime/Models/ModelTurnDetection.cs
@@ -11,6 +11,6 @@ public class ModelTurnDetection
 
 public class AudioTranscription
 {
-    public string Model { get; set; } = "gpt-4o-mini-transcribe";
+    public string Model { get; set; } = Gpt4xModelConstants.GPT_4o_Mini_Transcribe;
     public string? Language { get; set; }
 }
diff --git a/src/Infrastructure/BotSharp.Abstraction/Realtime/Settings/RealtimeModelSettings.cs b/src/Infrastructure/BotSharp.Abstraction/Realtime/Settings/RealtimeModelSettings.cs
index b66616fc7..6149de092 100644
--- a/src/Infrastructure/BotSharp.Abstraction/Realtime/Settings/RealtimeModelSettings.cs
+++ b/src/Infrastructure/BotSharp.Abstraction/Realtime/Settings/RealtimeModelSettings.cs
@@ -5,7 +5,7 @@ namespace BotSharp.Abstraction.Realtime.Settings;
 public class RealtimeModelSettings
 {
     public string Provider { get; set; } = "openai";
-    public string Model { get; set; } = "gpt-4o-mini-realtime-preview";
+    public string Model { get; set; } = Gpt4xModelConstants.GPT_4o_Mini_Realtime_Preview;
     public string[] Modalities { get; set; } = ["text", "audio"];
     public bool InterruptResponse { get; set; } = true;
     public string InputAudioFormat { get; set; } = "g711_ulaw";
diff --git a/src/Infrastructure/BotSharp.Core.Realtime/Services/RealtimeHub.cs b/src/Infrastructure/BotSharp.Core.Realtime/Services/RealtimeHub.cs
index d847e21b4..1292a0214 100644
--- a/src/Infrastructure/BotSharp.Core.Realtime/Services/RealtimeHub.cs
+++ b/src/Infrastructure/BotSharp.Core.Realtime/Services/RealtimeHub.cs
@@ -6,6 +6,7 @@
 using BotSharp.Abstraction.Realtime.Options;
 using BotSharp.Abstraction.Realtime.Settings;
 using BotSharp.Abstraction.Routing.Enums;
+using BotSharp.Abstraction.Settings;
 using BotSharp.Core.Infrastructures;
 
 namespace BotSharp.Core.Realtime.Services;
@@ -192,6 +193,7 @@ public RealtimeHubConnection SetHubConnection(string conversationId)
     {
         var provider = agent?.LlmConfig?.Realtime?.Provider;
         var model = agent?.LlmConfig?.Realtime?.Model;
+        var settingService = _services.GetRequiredService<ISettingService>();
 
         if (!string.IsNullOrEmpty(provider) && !string.IsNullOrEmpty(model))
         {
@@ -199,7 +201,7 @@ public RealtimeHubConnection SetHubConnection(string conversationId)
         }
 
         provider = _settings.Provider;
-        model = _settings.Model;
+        model = settingService.GetUpgradeModel(_settings.Model);
 
         if (!string.IsNullOrEmpty(provider) && !string.IsNullOrEmpty(model))
         {
diff --git a/src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationService.Summary.cs b/src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationService.Summary.cs
index c02187ecf..e2c06c609 100644
--- a/src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationService.Summary.cs
+++ b/src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationService.Summary.cs
@@ -1,6 +1,7 @@
 using BotSharp.Abstraction.Conversations.Enums;
 using BotSharp.Abstraction.MLTasks;
 using BotSharp.Abstraction.Models;
+using BotSharp.Abstraction.Settings;
 using BotSharp.Abstraction.Templating;
 
 namespace BotSharp.Core.Conversations.Services;
@@ -62,8 +63,10 @@ private async Task<string> Summarize(Agent agent, string prompt)
         string? model;
 
         var providerService = _services.GetRequiredService<ILlmProviderService>();
+        var settingService = _services.GetRequiredService<ISettingService>();
         var modelSettings = providerService.GetProviderModels(provider);
-        var modelSetting = modelSettings.FirstOrDefault(x => x.Name.IsEqualTo("gpt4-turbo") || x.Name.IsEqualTo("gpt-4o"));
+        var defaultModel = settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o);
+        var modelSetting = modelSettings.FirstOrDefault(x => x.Name.IsEqualTo(defaultModel));
 
         if (modelSetting != null)
         {
diff --git a/src/Infrastructure/BotSharp.Core/Files/Services/Instruct/FileInstructService.Image.cs b/src/Infrastructure/BotSharp.Core/Files/Services/Instruct/FileInstructService.Image.cs
index 50e912565..d1a0ca689 100644
--- a/src/Infrastructure/BotSharp.Core/Files/Services/Instruct/FileInstructService.Image.cs
+++ b/src/Infrastructure/BotSharp.Core/Files/Services/Instruct/FileInstructService.Image.cs
@@ -1,6 +1,8 @@
 using BotSharp.Abstraction.Instructs;
 using BotSharp.Abstraction.Instructs.Models;
 using BotSharp.Abstraction.Instructs.Options;
+using BotSharp.Abstraction.Models;
+using BotSharp.Abstraction.Settings;
 using System.IO;
 
 namespace BotSharp.Core.Files.Services;
@@ -9,11 +11,12 @@ public partial class FileInstructService
 {
     public async Task<string> ReadImages(string text, IEnumerable<InstructFileModel> images, InstructOptions? options = null)
     {
+        var settingService = _services.GetRequiredService<ISettingService>();
         var innerAgentId = options?.AgentId ?? Guid.Empty.ToString();
         var instruction = await RenderAgentTemplate(innerAgentId, options?.TemplateName, options?.Data);
         text = RenderText(text, options?.Data);
 
-        var completion = CompletionProvider.GetChatCompletion(_services, provider: options?.Provider ?? "openai", model: options?.Model ?? "gpt-4o", multiModal: true);
+        var completion = CompletionProvider.GetChatCompletion(_services, provider: options?.Provider ?? "openai", model: options?.Model ?? settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o), multiModal: true);
         var message = await completion.GetChatCompletions(new Agent()
         {
             Id = innerAgentId,
diff --git a/src/Infrastructure/BotSharp.Core/Infrastructures/CompletionProvider.cs b/src/Infrastructure/BotSharp.Core/Infrastructures/CompletionProvider.cs
index b5d989298..a2b73b33d 100644
--- a/src/Infrastructure/BotSharp.Core/Infrastructures/CompletionProvider.cs
+++ b/src/Infrastructure/BotSharp.Core/Infrastructures/CompletionProvider.cs
@@ -1,5 +1,7 @@
 using BotSharp.Abstraction.MLTasks;
 using BotSharp.Abstraction.MLTasks.Settings;
+using BotSharp.Abstraction.Models;
+using BotSharp.Abstraction.Settings;
 
 namespace BotSharp.Core.Infrastructures;
 
@@ -140,6 +142,7 @@ public static IAudioTranscription GetAudioTranscriber(
         string? provider = null,
         string? model = null)
     {
+        var settingService = services.GetRequiredService<ISettingService>();
         var completions = services.GetServices<IAudioTranscription>();
         var completer = completions.FirstOrDefault(x => x.Provider == (provider ?? "openai"));
         if (completer == null)
@@ -149,7 +152,7 @@ public static IAudioTranscription GetAudioTranscriber(
             return default!;
         }
 
-        completer.SetModelName(model ?? "gpt-4o-mini-transcribe");
+        completer.SetModelName(model ?? settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o_Mini_Transcribe));
         return completer;
     }
 
@@ -158,6 +161,7 @@ public static IAudioSynthesis GetAudioSynthesizer(
         string? provider = null,
         string? model = null)
     {
+        var settingService = services.GetRequiredService<ISettingService>();
         var completions = services.GetServices<IAudioSynthesis>();
         var completer = completions.FirstOrDefault(x => x.Provider == (provider ?? "openai"));
         if (completer == null)
@@ -167,7 +171,7 @@ public static IAudioSynthesis GetAudioSynthesizer(
             return default!;
         }
 
-        completer.SetModelName(model ?? "gpt-4o-mini-tts");
+        completer.SetModelName(model ?? settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o_Mini_Tts));
         return completer;
     }
 
diff --git a/src/Infrastructure/BotSharp.Core/Instructs/Services/InstructService.Instruct.cs b/src/Infrastructure/BotSharp.Core/Instructs/Services/InstructService.Instruct.cs
index 07ca2cf11..f75707605 100644
--- a/src/Infrastructure/BotSharp.Core/Instructs/Services/InstructService.Instruct.cs
+++ b/src/Infrastructure/BotSharp.Core/Instructs/Services/InstructService.Instruct.cs
@@ -1,5 +1,7 @@
 using BotSharp.Abstraction.Instructs.Options;
+using BotSharp.Abstraction.Models;
 using BotSharp.Abstraction.Options;
+using BotSharp.Abstraction.Settings;
 using BotSharp.Abstraction.Templating;
 using System.Collections;
 using System.Reflection;
@@ -86,9 +88,10 @@ private string BuildInstruction(string instruction, Dictionary<string, object> d
 
     private async Task<RoleDialogModel> GetAiResponse(string text, Agent agent, InstructOptions? options)
     {
+        var settingService = _services.GetRequiredService<ISettingService>();
         var dialogs = await BuildDialogs(text, options);
         var provider = options?.Provider ?? agent?.LlmConfig?.Provider ?? "openai";
-        var model = options?.Model ?? agent?.LlmConfig?.Model ?? "gpt-4o";
+        var model = options?.Model ?? agent?.LlmConfig?.Model ?? settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o);
         var completion = CompletionProvider.GetChatCompletion(_services, provider: provider, model: model);
         return await completion.GetChatCompletions(agent, dialogs);
     }
diff --git a/src/Infrastructure/BotSharp.Core/Shared/JsonRepairService.cs b/src/Infrastructure/BotSharp.Core/Shared/JsonRepairService.cs
index 8185893e8..281df8ee2 100644
--- a/src/Infrastructure/BotSharp.Core/Shared/JsonRepairService.cs
+++ b/src/Infrastructure/BotSharp.Core/Shared/JsonRepairService.cs
@@ -1,3 +1,5 @@
+using BotSharp.Abstraction.Models;
+using BotSharp.Abstraction.Settings;
 using BotSharp.Abstraction.Shared;
 using BotSharp.Abstraction.Shared.Options;
 using BotSharp.Abstraction.Templating;
@@ -93,12 +95,13 @@ private async Task<string> RepairByLLMAsync(string malformedJson, JsonRepairOpti
         var data = options?.Data ?? new Dictionary<string, object>();
         data["input"] = malformedJson;
         var prompt = render.Render(template, data);
+        var settingService = _services.GetRequiredService<ISettingService>();
 
         try
         {
             var completion = CompletionProvider.GetChatCompletion(_services,
                         provider: options?.Provider ?? agent?.LlmConfig?.Provider ?? "openai",
-                        model: options?.Model ?? agent?.LlmConfig?.Model ?? "gpt-4o-mini");
+                        model: options?.Model ?? agent?.LlmConfig?.Model ?? settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o_Mini));
 
             var innerAgent = new Agent
             {
diff --git a/src/Infrastructure/BotSharp.Core/WebSearch/Functions/WebIntelligentSearchFn.cs b/src/Infrastructure/BotSharp.Core/WebSearch/Functions/WebIntelligentSearchFn.cs
index 18cf6542f..1a7ae06e9 100644
--- a/src/Infrastructure/BotSharp.Core/WebSearch/Functions/WebIntelligentSearchFn.cs
+++ b/src/Infrastructure/BotSharp.Core/WebSearch/Functions/WebIntelligentSearchFn.cs
@@ -1,5 +1,7 @@
 using BotSharp.Abstraction.Functions;
 using BotSharp.Abstraction.MLTasks;
+using BotSharp.Abstraction.Models;
+using BotSharp.Abstraction.Settings;
 
 namespace BotSharp.Core.WebSearch.Functions;
 
@@ -70,7 +72,8 @@ private async Task<string> GetChatCompletion(Agent agent, List<RoleDialogModel>
     {
         var state = _services.GetRequiredService<IConversationStateService>();
         var llmProviderService = _services.GetRequiredService<ILlmProviderService>();
-
+        var settingService = _services.GetRequiredService<ISettingService>();
+        
         var provider = state.GetState("web_search_llm_provider");
         var model = state.GetState("web_search_llm_model");
 
@@ -80,7 +83,7 @@ private async Task<string> GetChatCompletion(Agent agent, List<RoleDialogModel>
         }
 
         provider = "openai";
-        model = "gpt-4o-mini-search-preview";
+        model = settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o_Mini_Search_Preview);
 
         var models = llmProviderService.GetProviderModels(provider);
         var foundModel = models.FirstOrDefault(x => x.WebSearch?.IsDefault == true)
diff --git a/src/Plugins/BotSharp.Plugin.AudioHandler/Functions/ReadAudioFn.cs b/src/Plugins/BotSharp.Plugin.AudioHandler/Functions/ReadAudioFn.cs
index 244262ffb..c172c7c40 100644
--- a/src/Plugins/BotSharp.Plugin.AudioHandler/Functions/ReadAudioFn.cs
+++ b/src/Plugins/BotSharp.Plugin.AudioHandler/Functions/ReadAudioFn.cs
@@ -1,3 +1,6 @@
+using BotSharp.Abstraction.Models;
+using BotSharp.Abstraction.Settings;
+
 namespace BotSharp.Plugin.AudioHandler.Functions;
 
 public class ReadAudioFn : IFunctionCallback
@@ -149,6 +152,7 @@ private bool VerifyAudioFileType(string fileName)
     {
         var provider = agent?.LlmConfig?.AudioTranscription?.Provider;
         var model = agent?.LlmConfig?.AudioTranscription?.Model;
+        var settingService = _services.GetRequiredService<ISettingService>();
 
         if (!string.IsNullOrEmpty(provider) && !string.IsNullOrEmpty(model))
         {
@@ -164,7 +168,7 @@ private bool VerifyAudioFileType(string fileName)
         }
 
         provider = "openai";
-        model = "gpt-4o-mini-transcribe";
+        model = settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o_Mini_Transcribe);
 
         return (provider, model);
     }
diff --git a/src/Plugins/BotSharp.Plugin.EmailHandler/Functions/HandleEmailReaderFn.cs b/src/Plugins/BotSharp.Plugin.EmailHandler/Functions/HandleEmailReaderFn.cs
index d778db17c..f1404390a 100644
--- a/src/Plugins/BotSharp.Plugin.EmailHandler/Functions/HandleEmailReaderFn.cs
+++ b/src/Plugins/BotSharp.Plugin.EmailHandler/Functions/HandleEmailReaderFn.cs
@@ -1,4 +1,6 @@
 using BotSharp.Abstraction.Messaging.Models.RichContent.Template;
+using BotSharp.Abstraction.Models;
+using BotSharp.Abstraction.Settings;
 using BotSharp.Plugin.EmailHandler.Models;
 using BotSharp.Plugin.EmailHandler.Providers;
 using MailKit;
@@ -66,8 +68,9 @@ public async Task<bool> Execute(RoleDialogModel message)
                     };
 
                     var llmProviderService = _services.GetRequiredService<ILlmProviderService>();
+                    var settingService = _services.GetRequiredService<ISettingService>();
                     var provider = llmProviderService.GetProviders().FirstOrDefault(x => x == "openai");
-                    var model = llmProviderService.GetProviderModel(provider: provider ?? "openai", id: "gpt-4o");
+                    var model = llmProviderService.GetProviderModel(provider: provider ?? "openai", id: settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o));
                     var completion = CompletionProvider.GetChatCompletion(_services, provider: provider, model: model?.Name);
                     var convService = _services.GetRequiredService<IConversationService>();
                     var conversationId = convService.ConversationId;
diff --git a/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/Realtime/RealTimeCompletionProvider.cs b/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/Realtime/RealTimeCompletionProvider.cs
index 51d2232fb..a99bbe4e3 100644
--- a/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/Realtime/RealTimeCompletionProvider.cs
+++ b/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/Realtime/RealTimeCompletionProvider.cs
@@ -2,6 +2,7 @@
 using BotSharp.Abstraction.Realtime.Options;
 using BotSharp.Abstraction.Realtime.Sessions;
 using BotSharp.Abstraction.Realtime.Settings;
+using BotSharp.Abstraction.Settings;
 using BotSharp.Core.Infrastructures.Streams;
 using BotSharp.Core.Session;
 using BotSharp.Plugin.GoogleAI.Models.Realtime;
@@ -87,8 +88,9 @@ public async Task Connect(
 
         var settingsService = _services.GetRequiredService<ILlmProviderService>();
         var realtimeModelSettings = _services.GetRequiredService<RealtimeModelSettings>();
+        var settingService = _services.GetRequiredService<ISettingService>();
 
-        _model ??= realtimeModelSettings.Model;
+        _model ??= settingService.GetUpgradeModel(realtimeModelSettings.Model);
         var modelSettings = settingsService.GetSetting(Provider, _model);
 
         Reset();
diff --git a/src/Plugins/BotSharp.Plugin.ImageHandler/Helpers/AiResponseHelper.cs b/src/Plugins/BotSharp.Plugin.ImageHandler/Helpers/AiResponseHelper.cs
index ce999e753..058c6f715 100644
--- a/src/Plugins/BotSharp.Plugin.ImageHandler/Helpers/AiResponseHelper.cs
+++ b/src/Plugins/BotSharp.Plugin.ImageHandler/Helpers/AiResponseHelper.cs
@@ -1,3 +1,5 @@
+using BotSharp.Abstraction.Models;
+
 namespace BotSharp.Plugin.ImageHandler.Helpers;
 
 internal static class AiResponseHelper
@@ -7,8 +9,9 @@ internal static async Task<string> GetImageGenerationResponse(IServiceProvider s
         var text = $"Please generate a user-friendly response from the following description to " +
                    $"inform user that you have completed the required image: {description}";
 
+        var settingService = services.GetRequiredService<ISettingService>();
         var provider = agent?.LlmConfig?.Provider ?? "openai";
-        var model = agent?.LlmConfig?.Model ?? "gpt-4o-mini";
+        var model = agent?.LlmConfig?.Model ?? settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o_Mini);
         var completion = CompletionProvider.GetChatCompletion(services, provider: provider, model: model);
         var response = await completion.GetChatCompletions(agent, [new RoleDialogModel(AgentRole.User, text)]);
         return response.Content.IfNullOrEmptyAs(GetDefaultResponse(files)) ?? string.Empty;
diff --git a/src/Plugins/BotSharp.Plugin.OpenAI/Models/Realtime/RealtimeSessionBody.cs b/src/Plugins/BotSharp.Plugin.OpenAI/Models/Realtime/RealtimeSessionBody.cs
index f767a6f16..90171ae0e 100644
--- a/src/Plugins/BotSharp.Plugin.OpenAI/Models/Realtime/RealtimeSessionBody.cs
+++ b/src/Plugins/BotSharp.Plugin.OpenAI/Models/Realtime/RealtimeSessionBody.cs
@@ -1,3 +1,5 @@
+using BotSharp.Abstraction.Models;
+
 namespace BotSharp.Plugin.OpenAI.Models.Realtime;
 
 public class RealtimeSessionBody
@@ -82,7 +84,7 @@ public class RealtimeSessionTurnDetection
 public class InputAudioTranscription
 {
     [JsonPropertyName("model")]
-    public string Model { get; set; } = "gpt-4o-transcribe";
+    public string Model { get; set; } = Gpt4xModelConstants.GPT_4o_Transcribe;
 
     [JsonPropertyName("language")]
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
diff --git a/src/Plugins/BotSharp.Plugin.OpenAI/Providers/Realtime/RealTimeCompletionProvider.cs b/src/Plugins/BotSharp.Plugin.OpenAI/Providers/Realtime/RealTimeCompletionProvider.cs
index b023f94d5..658cf3ca5 100644
--- a/src/Plugins/BotSharp.Plugin.OpenAI/Providers/Realtime/RealTimeCompletionProvider.cs
+++ b/src/Plugins/BotSharp.Plugin.OpenAI/Providers/Realtime/RealTimeCompletionProvider.cs
@@ -1,6 +1,8 @@
 using BotSharp.Abstraction.Hooks;
+using BotSharp.Abstraction.Models;
 using BotSharp.Abstraction.Realtime.Options;
 using BotSharp.Abstraction.Realtime.Settings;
+using BotSharp.Abstraction.Settings;
 using OpenAI.Chat;
 
 namespace BotSharp.Plugin.OpenAI.Providers.Realtime;
@@ -17,7 +19,7 @@ public class RealTimeCompletionProvider : IRealTimeCompletion
     private readonly ILogger<RealTimeCompletionProvider> _logger;
     private readonly BotSharpOptions _botsharpOptions;
 
-    private string _model = "gpt-4o-mini-realtime-preview";
+    private string _model = Gpt4xModelConstants.GPT_4o_Mini_Realtime_Preview;
     private LlmRealtimeSession _session;
     private RealtimeOptions? _realtimeOptions;
     private bool _isBlocking = false;
@@ -40,6 +42,9 @@ public RealTimeCompletionProvider(
         _logger = logger;
         _services = services;
         _botsharpOptions = botsharpOptions;
+
+        var settingService = _services.GetRequiredService<ISettingService>();
+        _model = settingService.GetUpgradeModel(_model);
     }
 
     public async Task Connect(
@@ -67,8 +72,9 @@ public async Task Connect(
 
         var settingsService = _services.GetRequiredService<ILlmProviderService>();
         var realtimeSettings = _services.GetRequiredService<RealtimeModelSettings>();
+        var settingService = _services.GetRequiredService<ISettingService>();
 
-        _model ??= realtimeSettings.Model;
+        _model ??= settingService.GetUpgradeModel(realtimeSettings.Model);
         var settings = settingsService.GetSetting(Provider, _model);
 
         _session = new LlmRealtimeSession(_services, new ChatSessionOptions
@@ -321,6 +327,7 @@ public async Task<string> UpdateSession(RealtimeHubConnection conn, bool isInit
     {
         var convService = _services.GetRequiredService<IConversationService>();
         var agentService = _services.GetRequiredService<IAgentService>();
+        var settingService = _services.GetRequiredService<ISettingService>();
 
         var conv = await convService.GetConversation(conn.ConversationId);
         var agent = await agentService.LoadAgent(conn.CurrentAgentId);
@@ -370,7 +377,7 @@ public async Task<string> UpdateSession(RealtimeHubConnection conn, bool isInit
 
             sessionUpdate.session.InputAudioTranscription = new InputAudioTranscription
             {
-                Model = realtimeModelSettings.InputAudioTranscription.Model,
+                Model = settingService.GetUpgradeModel(realtimeModelSettings.InputAudioTranscription.Model),
                 Language = realtimeModelSettings.InputAudioTranscription.Language,
                 Prompt = string.Join(", ", words.Select(x => x.ToLower().Trim()).Distinct()).SubstringMax(1024)
             };
diff --git a/src/Plugins/BotSharp.Plugin.Planner/Sequential/SequentialPlanner.cs b/src/Plugins/BotSharp.Plugin.Planner/Sequential/SequentialPlanner.cs
index 59743cb7c..cc22d742b 100644
--- a/src/Plugins/BotSharp.Plugin.Planner/Sequential/SequentialPlanner.cs
+++ b/src/Plugins/BotSharp.Plugin.Planner/Sequential/SequentialPlanner.cs
@@ -14,6 +14,9 @@ You may obtain a copy of the License at
   limitations under the License.
 ******************************************************************************/
 
+using BotSharp.Abstraction.Models;
+using BotSharp.Abstraction.Settings;
+
 namespace BotSharp.Plugin.Planner.Sequential;
 
 /// <summary>
@@ -166,7 +169,8 @@ public async Task<DecomposedStep> GetDecomposedStepAsync(Agent router, string me
         var inst = new DecomposedStep();
 
         var llmProviderService = _services.GetRequiredService<ILlmProviderService>();
-        var model = llmProviderService.GetProviderModel("openai", "gpt-4o");
+        var settingService = _services.GetRequiredService<ISettingService>();
+        var model = llmProviderService.GetProviderModel("openai", settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o));
 
         // chat completion
         var completion = CompletionProvider.GetChatCompletion(_services,
diff --git a/src/Plugins/BotSharp.Plugin.SqlDriver/Functions/SqlValidateFn.cs b/src/Plugins/BotSharp.Plugin.SqlDriver/Functions/SqlValidateFn.cs
index 6bee18312..7fc661a88 100644
--- a/src/Plugins/BotSharp.Plugin.SqlDriver/Functions/SqlValidateFn.cs
+++ b/src/Plugins/BotSharp.Plugin.SqlDriver/Functions/SqlValidateFn.cs
@@ -1,4 +1,5 @@
 using BotSharp.Abstraction.Instructs.Options;
+using BotSharp.Abstraction.Models;
 
 namespace BotSharp.Plugin.SqlDriver.Functions;
 
@@ -51,7 +52,7 @@ public async Task<bool> Execute(RoleDialogModel message)
 
         if (msgCopy.Data != null && msgCopy.Data is DbException ex)
         {
-            
+            var settingService = _services.GetRequiredService<ISettingService>();
             var instructService = _services.GetRequiredService<IInstructService>();
             var agentService = _services.GetRequiredService<IAgentService>();
             var states = _services.GetRequiredService<IConversationStateService>();
@@ -63,7 +64,7 @@ public async Task<bool> Execute(RoleDialogModel message)
                 new InstructOptions
                 {
                     Provider = "openai",
-                    Model = "gpt-4o",
+                    Model = settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o),
                     AgentId = BuiltInAgentId.SqlDriver,
                     TemplateName = "sql_statement_correctness",
                     Data = new Dictionary<string, object>
diff --git a/src/Plugins/BotSharp.Plugin.SqlDriver/Services/DbKnowledgeService.cs b/src/Plugins/BotSharp.Plugin.SqlDriver/Services/DbKnowledgeService.cs
index 09d75301d..47b607a3e 100644
--- a/src/Plugins/BotSharp.Plugin.SqlDriver/Services/DbKnowledgeService.cs
+++ b/src/Plugins/BotSharp.Plugin.SqlDriver/Services/DbKnowledgeService.cs
@@ -6,6 +6,7 @@
 using BotSharp.Abstraction.Knowledges.Enums;
 using BotSharp.Abstraction.VectorStorage.Models;
 using BotSharp.Plugin.SqlDriver.Models;
+using BotSharp.Abstraction.Models;
 
 namespace BotSharp.Plugin.SqlDriver.Services;
 
@@ -26,8 +27,9 @@ public async Task<bool> Import(ImportDbKnowledgeRequest request)
     {
         var sqlDriverSettings = _services.GetRequiredService<SqlDriverSetting>();
         var knowledgeService = _services.GetRequiredService<IKnowledgeService>();
+        var settingService = _services.GetRequiredService<ISettingService>();
         var provider = request.Provider ?? "openai";
-        var model = request.Model ?? "gpt-4o";
+        var model = request.Model ?? settingService.GetUpgradeModel(Gpt4xModelConstants.GPT_4o);
         var schema = request.Schema;
         var collectionName = request.KnowledgebaseCollection;
 
diff --git a/src/WebStarter/appsettings.json b/src/WebStarter/appsettings.json
index 39587b64e..e4ad7bf57 100644
--- a/src/WebStarter/appsettings.json
+++ b/src/WebStarter/appsettings.json
@@ -647,7 +647,7 @@
     "EnableTranslator": false,
     "LlmConfig": {
       "Provider": "openai",
-      "Model": "gpt-4.1-nano"
+      "Model": "gpt-5-nano"
     }
   },
 
diff --git a/tests/BotSharp.LLM.Tests/Core/LLMProvider.cs b/tests/BotSharp.LLM.Tests/Core/LLMProvider.cs
index 5dd3d4a59..7b4fd6523 100644
--- a/tests/BotSharp.LLM.Tests/Core/LLMProvider.cs
+++ b/tests/BotSharp.LLM.Tests/Core/LLMProvider.cs
@@ -75,7 +75,7 @@ public static (IServiceCollection services, IConfiguration config, string modelN
         
         public static (IServiceCollection services, IConfiguration config, string modelName) CreateOpenAI()
         {
-            string modelName = "gpt-4o-mini";
+            string modelName = "gpt-5-mini";
             
             var apiKey = Environment.GetEnvironmentVariable("OPEN_AI_APIKEY") ??
                          throw new Exception("OPEN_AI_APIKEY is not set");
diff --git a/tests/BotSharp.LLM.Tests/appsettings.json b/tests/BotSharp.LLM.Tests/appsettings.json
index db7c274aa..41ca7076d 100644
--- a/tests/BotSharp.LLM.Tests/appsettings.json
+++ b/tests/BotSharp.LLM.Tests/appsettings.json
@@ -168,7 +168,7 @@
     "EnableTranslator": false,
     "LlmConfig": {
       "Provider": "azure-openai",
-      "Model": "gpt-4o-mini"
+      "Model": "gpt-5-mini"
     }
   },
   //"MCPSettings": {