diff --git a/src/Primitives/CrestApps.Core.AI.Claude/Handlers/ClaudeChatInteractionSettingsHandler.cs b/src/Primitives/CrestApps.Core.AI.Claude/Handlers/ClaudeChatInteractionSettingsHandler.cs
index 3dade02f..bce9cc8f 100644
--- a/src/Primitives/CrestApps.Core.AI.Claude/Handlers/ClaudeChatInteractionSettingsHandler.cs
+++ b/src/Primitives/CrestApps.Core.AI.Claude/Handlers/ClaudeChatInteractionSettingsHandler.cs
@@ -19,6 +19,7 @@ public Task UpdatingAsync(ChatInteraction interaction, JsonElement settings)
         interaction.Alter<ClaudeSessionMetadata>(metadata =>
         {
             metadata.ClaudeModel = GetString(settings, "anthropicModel");
+            metadata.EffortLevel = GetEnum<ClaudeEffortLevel>(settings, "anthropicEffortLevel");
         });
 
         return Task.CompletedTask;
@@ -38,4 +39,22 @@ private static string GetString(JsonElement element, string propertyName)
 
         return null;
     }
+
+    private static T GetEnum<T>(JsonElement element, string propertyName) where T : struct, Enum
+    {
+        if (element.TryGetProperty(propertyName, out var prop))
+        {
+            if (prop.ValueKind == JsonValueKind.Number && Enum.IsDefined(typeof(T), prop.GetInt32()))
+            {
+                return (T)(object)prop.GetInt32();
+            }
+
+            if (prop.ValueKind == JsonValueKind.String && Enum.TryParse<T>(prop.GetString(), ignoreCase: true, out var result))
+            {
+                return result;
+            }
+        }
+
+        return default;
+    }
 }
diff --git a/src/Primitives/CrestApps.Core.AI.Claude/Models/ClaudeEffortLevel.cs b/src/Primitives/CrestApps.Core.AI.Claude/Models/ClaudeEffortLevel.cs
new file mode 100644
index 00000000..be119aa3
--- /dev/null
+++ b/src/Primitives/CrestApps.Core.AI.Claude/Models/ClaudeEffortLevel.cs
@@ -0,0 +1,28 @@
+namespace CrestApps.Core.AI.Claude.Models;
+
+/// <summary>
+/// The reasoning effort level for Anthropic extended thinking.
+/// Maps to the <c>budget_tokens</c> parameter.
+/// </summary>
+public enum ClaudeEffortLevel
+{
+    /// <summary>
+    /// No effort level specified; the API default is used.
+    /// </summary>
+    None = 0,
+
+    /// <summary>
+    /// Low reasoning effort.
+    /// </summary>
+    Low = 1,
+
+    /// <summary>
+    /// Medium reasoning effort.
+    /// </summary>
+    Medium = 2,
+
+    /// <summary>
+    /// High reasoning effort.
+    /// </summary>
+    High = 3,
+}
diff --git a/src/Primitives/CrestApps.Core.AI.Claude/Models/ClaudeSessionMetadata.cs b/src/Primitives/CrestApps.Core.AI.Claude/Models/ClaudeSessionMetadata.cs
index 8a3772b1..a1dacfe5 100644
--- a/src/Primitives/CrestApps.Core.AI.Claude/Models/ClaudeSessionMetadata.cs
+++ b/src/Primitives/CrestApps.Core.AI.Claude/Models/ClaudeSessionMetadata.cs
@@ -10,4 +10,9 @@ public sealed class ClaudeSessionMetadata
     /// The Anthropic model override for the session.
     /// </summary>
     public string ClaudeModel { get; set; }
+
+    /// <summary>
+    /// The reasoning effort level for the session.
+    /// </summary>
+    public ClaudeEffortLevel EffortLevel { get; set; }
 }
diff --git a/src/Primitives/CrestApps.Core.AI.Claude/Services/ClaudeOrchestrator.cs b/src/Primitives/CrestApps.Core.AI.Claude/Services/ClaudeOrchestrator.cs
index a5ed191b..9f4cc220 100644
--- a/src/Primitives/CrestApps.Core.AI.Claude/Services/ClaudeOrchestrator.cs
+++ b/src/Primitives/CrestApps.Core.AI.Claude/Services/ClaudeOrchestrator.cs
@@ -60,6 +60,7 @@ public async IAsyncEnumerable<ChatResponseUpdate> ExecuteStreamingAsync(
         var modelId = !string.IsNullOrWhiteSpace(metadata?.ClaudeModel)
             ? metadata.ClaudeModel
             : null;
+        var effortLevel = metadata?.EffortLevel ?? ClaudeEffortLevel.None;
         var anthropicOptions = _anthropicOptions.Value;
         modelId ??= anthropicOptions.DefaultModel;
 
@@ -90,7 +91,7 @@ public async IAsyncEnumerable<ChatResponseUpdate> ExecuteStreamingAsync(
         });
 
         var configuredClient = builder.Build(context.ServiceProvider);
-        var chatOptions = BuildChatOptions(context.CompletionContext, modelId);
+        var chatOptions = BuildChatOptions(context.CompletionContext, modelId, effortLevel);
         var prompts = BuildPrompts(context);
         ChatResponseUpdate errorResponse = null;
 
@@ -134,9 +135,9 @@ private static bool IsConfigured(ClaudeOptions options)
             !string.IsNullOrWhiteSpace(options.DefaultModel);
     }
 
-    private static ChatOptions BuildChatOptions(AICompletionContext context, string modelId)
+    private static ChatOptions BuildChatOptions(AICompletionContext context, string modelId, ClaudeEffortLevel effortLevel)
     {
-        return new ChatOptions
+        var options = new ChatOptions
         {
             ModelId = modelId,
             Temperature = context.Temperature,
@@ -145,6 +146,25 @@ private static ChatOptions BuildChatOptions(AICompletionContext context, string
             PresencePenalty = context.PresencePenalty,
             MaxOutputTokens = context.MaxTokens,
         };
+
+        if (effortLevel != ClaudeEffortLevel.None)
+        {
+            var effortValue = effortLevel switch
+            {
+                ClaudeEffortLevel.Low => "low",
+                ClaudeEffortLevel.Medium => "medium",
+                ClaudeEffortLevel.High => "high",
+                _ => null,
+            };
+
+            if (effortValue is not null)
+            {
+                options.AdditionalProperties ??= [];
+                options.AdditionalProperties["reasoning_effort"] = effortValue;
+            }
+        }
+
+        return options;
     }
 
     private static List<ChatMessage> BuildPrompts(OrchestrationContext context)
diff --git a/src/Primitives/CrestApps.Core.AI.Copilot/Handlers/CopilotChatInteractionSettingsHandler.cs b/src/Primitives/CrestApps.Core.AI.Copilot/Handlers/CopilotChatInteractionSettingsHandler.cs
index acd7c2b1..ba956057 100644
--- a/src/Primitives/CrestApps.Core.AI.Copilot/Handlers/CopilotChatInteractionSettingsHandler.cs
+++ b/src/Primitives/CrestApps.Core.AI.Copilot/Handlers/CopilotChatInteractionSettingsHandler.cs
@@ -26,6 +26,7 @@ public Task UpdatingAsync(ChatInteraction interaction, JsonElement settings)
         {
             metadata.CopilotModel = copilotModel;
             metadata.IsAllowAll = isAllowAll;
+            metadata.ReasoningEffort = GetEnum<CopilotReasoningEffort>(settings, "copilotReasoningEffort");
         });
         return Task.CompletedTask;
     }
@@ -62,4 +63,22 @@ private static bool GetBool(JsonElement element, string propertyName)
 
         return false;
     }
+
+    private static T GetEnum<T>(JsonElement element, string propertyName) where T : struct, Enum
+    {
+        if (element.TryGetProperty(propertyName, out var prop))
+        {
+            if (prop.ValueKind == JsonValueKind.Number && Enum.IsDefined(typeof(T), prop.GetInt32()))
+            {
+                return (T)(object)prop.GetInt32();
+            }
+
+            if (prop.ValueKind == JsonValueKind.String && Enum.TryParse<T>(prop.GetString(), true, out var result))
+            {
+                return result;
+            }
+        }
+
+        return default;
+    }
 }
diff --git a/src/Primitives/CrestApps.Core.AI.Copilot/Models/CopilotModelInfo.cs b/src/Primitives/CrestApps.Core.AI.Copilot/Models/CopilotModelInfo.cs
index 6a0036d3..a8752272 100644
--- a/src/Primitives/CrestApps.Core.AI.Copilot/Models/CopilotModelInfo.cs
+++ b/src/Primitives/CrestApps.Core.AI.Copilot/Models/CopilotModelInfo.cs
@@ -14,4 +14,10 @@ public sealed class CopilotModelInfo
     /// The display name of the model.
     /// </summary>
     public string Name { get; set; }
+
+    /// <summary>
+    /// The premium request cost multiplier (e.g., 1 for standard, 0.33 for discounted, 3 for premium).
+    /// A value of <c>0</c> means unknown.
+    /// </summary>
+    public double CostMultiplier { get; set; }
 }
diff --git a/src/Primitives/CrestApps.Core.AI.Copilot/Models/CopilotReasoningEffort.cs b/src/Primitives/CrestApps.Core.AI.Copilot/Models/CopilotReasoningEffort.cs
new file mode 100644
index 00000000..92668ad2
--- /dev/null
+++ b/src/Primitives/CrestApps.Core.AI.Copilot/Models/CopilotReasoningEffort.cs
@@ -0,0 +1,27 @@
+namespace CrestApps.Core.AI.Copilot.Models;
+
+/// <summary>
+/// The reasoning effort level for GitHub Copilot sessions.
+/// </summary>
+public enum CopilotReasoningEffort
+{
+    /// <summary>
+    /// No explicit effort level; use the model default.
+    /// </summary>
+    None = 0,
+
+    /// <summary>
+    /// Low reasoning effort.
+    /// </summary>
+    Low = 1,
+
+    /// <summary>
+    /// Medium reasoning effort.
+    /// </summary>
+    Medium = 2,
+
+    /// <summary>
+    /// High reasoning effort.
+    /// </summary>
+    High = 3,
+}
diff --git a/src/Primitives/CrestApps.Core.AI.Copilot/Models/CopilotSessionMetadata.cs b/src/Primitives/CrestApps.Core.AI.Copilot/Models/CopilotSessionMetadata.cs
index b9f9906a..a4019971 100644
--- a/src/Primitives/CrestApps.Core.AI.Copilot/Models/CopilotSessionMetadata.cs
+++ b/src/Primitives/CrestApps.Core.AI.Copilot/Models/CopilotSessionMetadata.cs
@@ -40,4 +40,9 @@ public sealed class CopilotSessionMetadata
     /// When the access token expires.
     /// </summary>
     public DateTime? ExpiresAt { get; set; }
+
+    /// <summary>
+    /// The reasoning effort level for the session.
+    /// </summary>
+    public CopilotReasoningEffort ReasoningEffort { get; set; }
 }
diff --git a/src/Primitives/CrestApps.Core.AI.Copilot/Services/CopilotOrchestrator.cs b/src/Primitives/CrestApps.Core.AI.Copilot/Services/CopilotOrchestrator.cs
index a39a8ca6..3d611607 100644
--- a/src/Primitives/CrestApps.Core.AI.Copilot/Services/CopilotOrchestrator.cs
+++ b/src/Primitives/CrestApps.Core.AI.Copilot/Services/CopilotOrchestrator.cs
@@ -103,6 +103,7 @@ public async IAsyncEnumerable<ChatResponseUpdate> ExecuteStreamingAsync(Orchestr
         {
             metadata = md;
             sessionConfig.Model = metadata.CopilotModel;
+            sessionConfig.ReasoningEffort = GetReasoningEffortValue(metadata.ReasoningEffort);
             sessionConfig.OnPermissionRequest = CreatePermissionRequestHandler(metadata.IsAllowAll);
         }
 
@@ -267,6 +268,17 @@ private static PermissionRequestHandler CreatePermissionRequestHandler(bool allo
         return (request, invocation) => Task.FromResult(new PermissionRequestResult { Kind = PermissionRequestResultKind.DeniedCouldNotRequestFromUser, });
     }
 
+    private static string GetReasoningEffortValue(CopilotReasoningEffort reasoningEffort)
+    {
+        return reasoningEffort switch
+        {
+            CopilotReasoningEffort.Low => "low",
+            CopilotReasoningEffort.Medium => "medium",
+            CopilotReasoningEffort.High => "high",
+            _ => null,
+        };
+    }
+
     /// <summary>
     /// Configures the BYOK provider on the session config using the options.
     /// </summary>
diff --git a/src/Primitives/CrestApps.Core.AI.Copilot/Services/GitHubOAuthService.cs b/src/Primitives/CrestApps.Core.AI.Copilot/Services/GitHubOAuthService.cs
index b39dcc66..aab60fc6 100644
--- a/src/Primitives/CrestApps.Core.AI.Copilot/Services/GitHubOAuthService.cs
+++ b/src/Primitives/CrestApps.Core.AI.Copilot/Services/GitHubOAuthService.cs
@@ -283,6 +283,7 @@ public async Task<IReadOnlyCollection<CopilotModelInfo>> ListModelsAsync(
                 {
                     Id = m.Id,
                     Name = !string.IsNullOrEmpty(m.Name) ? m.Name : m.Id,
+                    CostMultiplier = m.Billing?.Multiplier ?? 0,
                 })
                 .ToList();
         }
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Controllers/AIProfileController.cs b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Controllers/AIProfileController.cs
index 43a140f1..e39dc6d6 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Controllers/AIProfileController.cs
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Controllers/AIProfileController.cs
@@ -249,7 +249,7 @@ private async Task PopulateDropdownsAsync(AIProfileViewModel model)
                     var cred = await _oauthService.GetCredentialAsync(userId);
                     model.CopilotGitHubUsername = cred?.GitHubUsername;
                     var models = await _oauthService.ListModelsAsync(userId);
-                    model.CopilotAvailableModels = models.Select(m => new SelectListItem(m.Name, m.Id)).ToList();
+                    model.CopilotAvailableModels = models.Select(m => new SelectListItem(FormatCopilotModelName(m), m.Id)).ToList();
                 }
             }
         }
@@ -428,7 +428,7 @@ private static void ApplyTemplateToProfile(AIProfile profile, AIProfileTemplate
 
         if (template.TryGet<CopilotSessionMetadata>(out var copilotMetadata))
         {
-            profile.Put(new CopilotSessionMetadata { CopilotModel = copilotMetadata.CopilotModel, IsAllowAll = copilotMetadata.IsAllowAll, });
+            profile.Put(new CopilotSessionMetadata { CopilotModel = copilotMetadata.CopilotModel, ReasoningEffort = copilotMetadata.ReasoningEffort, IsAllowAll = copilotMetadata.IsAllowAll, });
         }
         else
         {
@@ -437,7 +437,7 @@ private static void ApplyTemplateToProfile(AIProfile profile, AIProfileTemplate
 
         if (template.TryGet<ClaudeSessionMetadata>(out var anthropicMetadata))
         {
-            profile.Put(new ClaudeSessionMetadata { ClaudeModel = anthropicMetadata.ClaudeModel, });
+            profile.Put(new ClaudeSessionMetadata { ClaudeModel = anthropicMetadata.ClaudeModel, EffortLevel = anthropicMetadata.EffortLevel, });
         }
         else
         {
@@ -486,4 +486,13 @@ private async Task PopulateClaudeModelsAsync(AIProfileViewModel model)
     }
 
     private bool IsCopilotConfigured() => _copilotOptions.IsConfigured();
+
+    private static string FormatCopilotModelName(CopilotModelInfo model)
+    {
+        var name = !string.IsNullOrWhiteSpace(model.Name) ? model.Name : model.Id;
+
+        return model.CostMultiplier > 0
+            ? $"{name} (x{model.CostMultiplier.ToString("0.##", System.Globalization.CultureInfo.InvariantCulture)})"
+            : name;
+    }
 }
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Controllers/AITemplateController.cs b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Controllers/AITemplateController.cs
index f0490d1b..bab3194a 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Controllers/AITemplateController.cs
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Controllers/AITemplateController.cs
@@ -1,3 +1,4 @@
+using System.Globalization;
 using CrestApps.Core.AI;
 using CrestApps.Core.AI.A2A.Models;
 using CrestApps.Core.AI.Claude.Models;
@@ -337,8 +338,17 @@ private async Task PopulateCopilotStatusAsync(AITemplateViewModel model)
         var credential = await _oauthService.GetCredentialAsync(userId);
         model.CopilotGitHubUsername = credential?.GitHubUsername;
         var models = await _oauthService.ListModelsAsync(userId);
-        model.CopilotAvailableModels = models.Select(m => new SelectListItem(m.Name, m.Id)).ToList();
+        model.CopilotAvailableModels = models.Select(m => new SelectListItem(FormatCopilotModelName(m), m.Id)).ToList();
     }
 
     private bool IsCopilotConfigured() => _copilotOptions.IsConfigured();
+
+    private static string FormatCopilotModelName(CopilotModelInfo model)
+    {
+        var name = !string.IsNullOrWhiteSpace(model.Name) ? model.Name : model.Id;
+
+        return model.CostMultiplier > 0
+            ? $"{name} (x{model.CostMultiplier.ToString("0.##", CultureInfo.InvariantCulture)})"
+            : name;
+    }
 }
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/ViewModels/AIProfileViewModel.cs b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/ViewModels/AIProfileViewModel.cs
index 4bad49a4..e97de9e2 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/ViewModels/AIProfileViewModel.cs
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/ViewModels/AIProfileViewModel.cs
@@ -138,11 +138,15 @@ public sealed class AIProfileViewModel
     // Anthropic
     public string ClaudeModel { get; set; }
 
+    public ClaudeEffortLevel ClaudeEffortLevel { get; set; }
+
     public bool ClaudeIsConfigured { get; set; }
 
     // Copilot
     public string CopilotModel { get; set; }
 
+    public CopilotReasoningEffort CopilotReasoningEffort { get; set; }
+
     public bool CopilotIsAllowAll { get; set; }
 
     public bool CopilotIsConfigured { get; set; }
@@ -337,12 +341,14 @@ public static AIProfileViewModel FromProfile(AIProfile profile)
         if (profile.TryGet<CopilotSessionMetadata>(out var copilotMeta))
         {
             vm.CopilotModel = copilotMeta.CopilotModel;
+            vm.CopilotReasoningEffort = copilotMeta.ReasoningEffort;
             vm.CopilotIsAllowAll = copilotMeta.IsAllowAll;
         }
 
         if (profile.TryGet<ClaudeSessionMetadata>(out var anthropicMeta))
         {
             vm.ClaudeModel = anthropicMeta.ClaudeModel;
+            vm.ClaudeEffortLevel = anthropicMeta.EffortLevel;
         }
 
         return vm;
@@ -549,6 +555,7 @@ public void ApplyTo(AIProfile profile)
             profile.Alter<ClaudeSessionMetadata>(metadata =>
             {
                 metadata.ClaudeModel = ClaudeModel;
+                metadata.EffortLevel = ClaudeEffortLevel;
             });
         }
         else
@@ -563,6 +570,7 @@ public void ApplyTo(AIProfile profile)
             profile.Alter<CopilotSessionMetadata>(metadata =>
             {
                 metadata.CopilotModel = CopilotModel;
+                metadata.ReasoningEffort = CopilotReasoningEffort;
                 metadata.IsAllowAll = CopilotIsAllowAll;
             });
         }
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/ViewModels/AITemplateViewModel.cs b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/ViewModels/AITemplateViewModel.cs
index 0985a136..acd5b2b9 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/ViewModels/AITemplateViewModel.cs
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/ViewModels/AITemplateViewModel.cs
@@ -120,6 +120,8 @@ public sealed class AITemplateViewModel
     // Anthropic.
     public string ClaudeModel { get; set; }
 
+    public ClaudeEffortLevel ClaudeEffortLevel { get; set; }
+
     public bool ClaudeIsConfigured { get; set; }
 
     // Settings.
@@ -129,6 +131,8 @@ public sealed class AITemplateViewModel
     // Copilot.
     public string CopilotModel { get; set; }
 
+    public CopilotReasoningEffort CopilotReasoningEffort { get; set; }
+
     public bool CopilotIsAllowAll { get; set; }
 
     public bool CopilotIsConfigured { get; set; }
@@ -312,12 +316,14 @@ public static AITemplateViewModel FromTemplate(AIProfileTemplate template)
             if (template.TryGet<CopilotSessionMetadata>(out var copilotMetadata))
             {
                 model.CopilotModel = copilotMetadata.CopilotModel;
+                model.CopilotReasoningEffort = copilotMetadata.ReasoningEffort;
                 model.CopilotIsAllowAll = copilotMetadata.IsAllowAll;
             }
 
             if (template.TryGet<ClaudeSessionMetadata>(out var anthropicMetadata))
             {
                 model.ClaudeModel = anthropicMetadata.ClaudeModel;
+                model.ClaudeEffortLevel = anthropicMetadata.EffortLevel;
             }
         }
 
@@ -522,6 +528,7 @@ public void ApplyTo(AIProfileTemplate template)
                 template.Put(new ClaudeSessionMetadata
                 {
                     ClaudeModel = ClaudeModel,
+                    EffortLevel = ClaudeEffortLevel,
                 });
             }
             else
@@ -535,6 +542,7 @@ public void ApplyTo(AIProfileTemplate template)
                 template.Put(new CopilotSessionMetadata
                 {
                     CopilotModel = CopilotModel,
+                    ReasoningEffort = CopilotReasoningEffort,
                     IsAllowAll = CopilotIsAllowAll,
                 });
             }
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AIProfile/Create.cshtml b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AIProfile/Create.cshtml
index 05310b44..8022de28 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AIProfile/Create.cshtml
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AIProfile/Create.cshtml
@@ -161,6 +161,7 @@
                         { "CopilotIsAuth", Model.CopilotIsAuthenticated },
                         { "CopilotUsername", Model.CopilotGitHubUsername },
                         { "CopilotModel", Model.CopilotModel },
+                        { "CopilotReasoningEffort", Model.CopilotReasoningEffort },
                         { "CopilotIsAllowAll", Model.CopilotIsAllowAll },
                         { "CopilotModels", Model.CopilotAvailableModels },
                     })
@@ -168,6 +169,7 @@
                         { "ClaudePrefix", "ap" },
                         { "ClaudeIsConfigured", Model.ClaudeIsConfigured },
                         { "ClaudeModel", Model.ClaudeModel },
+                        { "ClaudeEffortLevel", Model.ClaudeEffortLevel },
                         { "ClaudeModels", Model.AnthropicAvailableModels },
                     })
 
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AIProfile/Edit.cshtml b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AIProfile/Edit.cshtml
index 7856daff..c022a33e 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AIProfile/Edit.cshtml
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AIProfile/Edit.cshtml
@@ -217,6 +217,7 @@
                         { "CopilotIsAuth", Model.CopilotIsAuthenticated },
                         { "CopilotUsername", Model.CopilotGitHubUsername },
                         { "CopilotModel", Model.CopilotModel },
+                        { "CopilotReasoningEffort", Model.CopilotReasoningEffort },
                         { "CopilotIsAllowAll", Model.CopilotIsAllowAll },
                         { "CopilotModels", Model.CopilotAvailableModels },
                     })
@@ -224,6 +225,7 @@
                         { "ClaudePrefix", "ap" },
                         { "ClaudeIsConfigured", Model.ClaudeIsConfigured },
                         { "ClaudeModel", Model.ClaudeModel },
+                        { "ClaudeEffortLevel", Model.ClaudeEffortLevel },
                         { "ClaudeModels", Model.AnthropicAvailableModels },
                     })
 
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AITemplate/Create.cshtml b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AITemplate/Create.cshtml
index 45d191fa..55a24d8d 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AITemplate/Create.cshtml
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AITemplate/Create.cshtml
@@ -151,6 +151,7 @@
                             { "CopilotIsAuth", Model.CopilotIsAuthenticated },
                             { "CopilotUsername", Model.CopilotGitHubUsername },
                             { "CopilotModel", Model.CopilotModel },
+                            { "CopilotReasoningEffort", Model.CopilotReasoningEffort },
                             { "CopilotIsAllowAll", Model.CopilotIsAllowAll },
                             { "CopilotModels", Model.CopilotAvailableModels },
                         })
@@ -159,6 +160,7 @@
                             { "ClaudePrefix", "at" },
                             { "ClaudeIsConfigured", Model.ClaudeIsConfigured },
                             { "ClaudeModel", Model.ClaudeModel },
+                            { "ClaudeEffortLevel", Model.ClaudeEffortLevel },
                             { "ClaudeModels", Model.AnthropicAvailableModels },
                         })
 
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AITemplate/Edit.cshtml b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AITemplate/Edit.cshtml
index 17d82871..5a7800f3 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AITemplate/Edit.cshtml
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AI/Views/AITemplate/Edit.cshtml
@@ -152,6 +152,7 @@
                             { "CopilotIsAuth", Model.CopilotIsAuthenticated },
                             { "CopilotUsername", Model.CopilotGitHubUsername },
                             { "CopilotModel", Model.CopilotModel },
+                            { "CopilotReasoningEffort", Model.CopilotReasoningEffort },
                             { "CopilotIsAllowAll", Model.CopilotIsAllowAll },
                             { "CopilotModels", Model.CopilotAvailableModels },
                         })
@@ -160,6 +161,7 @@
                             { "ClaudePrefix", "at" },
                             { "ClaudeIsConfigured", Model.ClaudeIsConfigured },
                             { "ClaudeModel", Model.ClaudeModel },
+                            { "ClaudeEffortLevel", Model.ClaudeEffortLevel },
                             { "ClaudeModels", Model.AnthropicAvailableModels },
                         })
                         <!-- Chat & TemplatePrompt: Prompt Subject -->
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AIChat/Controllers/CopilotAuthController.cs b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AIChat/Controllers/CopilotAuthController.cs
index 37ef4d2a..5a8e3d29 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/AIChat/Controllers/CopilotAuthController.cs
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/AIChat/Controllers/CopilotAuthController.cs
@@ -114,7 +114,7 @@ public async Task<IActionResult> Models()
 
         var models = await _oauthService.ListModelsAsync(userId);
 
-        return Json(models.Select(m => new { m.Id, m.Name }));
+        return Json(models.Select(m => new { m.Id, m.Name, m.CostMultiplier }));
     }
 
     [HttpPost]
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/Controllers/ChatInteractionController.cs b/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/Controllers/ChatInteractionController.cs
index 822ea68d..b862f90c 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/Controllers/ChatInteractionController.cs
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/Controllers/ChatInteractionController.cs
@@ -237,6 +237,7 @@ public async Task<IActionResult> Chat(string id)
             DataSourceIsInScope = ragMetadata?.IsInScope ?? false,
             DataSourceFilter = ragMetadata?.Filter,
             ClaudeModel = anthropicMetadata?.ClaudeModel,
+            ClaudeEffortLevel = anthropicMetadata?.EffortLevel ?? CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.None,
             SelectedA2AConnectionIds = interaction.A2AConnectionIds?.ToArray() ?? [],
             SelectedMcpConnectionIds = interaction.McpConnectionIds?.ToArray() ?? [],
             SelectedToolNames = interaction.ToolNames?.ToArray() ?? [],
@@ -581,6 +582,7 @@ private async Task ApplyMetadataAsync(ChatInteraction interaction, ChatInteracti
             interaction.Alter<ClaudeSessionMetadata>(metadata =>
             {
                 metadata.ClaudeModel = model.ClaudeModel;
+                metadata.EffortLevel = model.ClaudeEffortLevel;
             });
         }
         else
@@ -593,6 +595,7 @@ private async Task ApplyMetadataAsync(ChatInteraction interaction, ChatInteracti
             interaction.Alter<CopilotSessionMetadata>(metadata =>
             {
                 metadata.CopilotModel = model.CopilotModel;
+                metadata.ReasoningEffort = model.CopilotReasoningEffort;
                 metadata.IsAllowAll = model.CopilotIsAllowAll;
             });
         }
@@ -771,7 +774,7 @@ private async Task PopulateCopilotStatusAsync(ChatInteractionViewModel model)
                     model.CopilotGitHubUsername = cred?.GitHubUsername;
                     var models = await _oauthService.ListModelsAsync(userId);
                     model.CopilotAvailableModels = models
-                        .Select(m => new SelectListItem(m.Name, m.Id))
+                        .Select(m => new SelectListItem(FormatCopilotModelName(m), m.Id))
                         .ToList();
                 }
             }
@@ -816,7 +819,7 @@ private async Task PopulateCopilotChatStatusAsync(ChatInteractionChatViewModel m
                     model.CopilotGitHubUsername = cred?.GitHubUsername;
                     var models = await _oauthService.ListModelsAsync(userId);
                     model.CopilotAvailableModels = models
-                        .Select(m => new SelectListItem(m.Name, m.Id))
+                        .Select(m => new SelectListItem(FormatCopilotModelName(m), m.Id))
                         .ToList();
                 }
             }
@@ -828,7 +831,7 @@ private async Task PopulateCopilotChatStatusAsync(ChatInteractionChatViewModel m
         if (interaction != null && interaction.TryGet<CopilotSessionMetadata>(out var copilotMeta))
         {
             model.CopilotModel = copilotMeta.CopilotModel;
-
+            model.CopilotReasoningEffort = copilotMeta.ReasoningEffort;
             model.CopilotIsAllowAll = copilotMeta.IsAllowAll;
         }
     }
@@ -847,4 +850,13 @@ private async Task PopulateClaudeModelsAsync(ChatInteractionChatViewModel model)
     }
 
     private bool IsCopilotConfigured() => _copilotOptions.IsConfigured();
+
+    private static string FormatCopilotModelName(CopilotModelInfo model)
+    {
+        var name = !string.IsNullOrWhiteSpace(model.Name) ? model.Name : model.Id;
+
+        return model.CostMultiplier > 0
+            ? $"{name} (x{model.CostMultiplier.ToString("0.##", System.Globalization.CultureInfo.InvariantCulture)})"
+            : name;
+    }
 }
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/ViewModels/ChatInteractionChatViewModel.cs b/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/ViewModels/ChatInteractionChatViewModel.cs
index f408707a..703e7971 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/ViewModels/ChatInteractionChatViewModel.cs
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/ViewModels/ChatInteractionChatViewModel.cs
@@ -75,6 +75,8 @@ internal sealed class ChatInteractionChatViewModel
     // Copilot
     public string CopilotModel { get; set; }
 
+    public CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort CopilotReasoningEffort { get; set; }
+
     public bool CopilotIsAllowAll { get; set; }
 
     public bool CopilotIsConfigured { get; set; }
@@ -88,6 +90,8 @@ internal sealed class ChatInteractionChatViewModel
     // Anthropic
     public string ClaudeModel { get; set; }
 
+    public CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel ClaudeEffortLevel { get; set; }
+
     public bool ClaudeIsConfigured { get; set; }
 
     // Existing messages for the chat
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/ViewModels/ChatInteractionViewModel.cs b/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/ViewModels/ChatInteractionViewModel.cs
index 4e818758..48b332a2 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/ViewModels/ChatInteractionViewModel.cs
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/ViewModels/ChatInteractionViewModel.cs
@@ -62,6 +62,8 @@ public sealed class ChatInteractionViewModel
     // Copilot
     public string CopilotModel { get; set; }
 
+    public CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort CopilotReasoningEffort { get; set; }
+
     public bool CopilotIsAllowAll { get; set; }
 
     public bool CopilotIsConfigured { get; set; }
@@ -75,6 +77,8 @@ public sealed class ChatInteractionViewModel
     // Anthropic
     public string ClaudeModel { get; set; }
 
+    public CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel ClaudeEffortLevel { get; set; }
+
     public bool ClaudeIsConfigured { get; set; }
 
     [BindNever]
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/Views/ChatInteraction/Chat.cshtml b/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/Views/ChatInteraction/Chat.cshtml
index 916964ed..d08033de 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/Views/ChatInteraction/Chat.cshtml
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/Views/ChatInteraction/Chat.cshtml
@@ -216,6 +216,7 @@
                         { "CopilotIsAuth", Model.CopilotIsAuthenticated },
                         { "CopilotUsername", Model.CopilotGitHubUsername },
                         { "CopilotModel", Model.CopilotModel },
+                        { "CopilotReasoningEffort", Model.CopilotReasoningEffort },
                         { "CopilotIsAllowAll", Model.CopilotIsAllowAll },
                         { "CopilotModels", Model.CopilotAvailableModels },
                     })
@@ -223,6 +224,7 @@
                         { "ClaudePrefix", "ci" },
                         { "ClaudeIsConfigured", Model.ClaudeIsConfigured },
                         { "ClaudeModel", Model.ClaudeModel },
+                        { "ClaudeEffortLevel", Model.ClaudeEffortLevel },
                         { "ClaudeModels", Model.AnthropicAvailableModels },
                     })
 
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/Views/ChatInteraction/Create.cshtml b/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/Views/ChatInteraction/Create.cshtml
index fdb2a52e..6536b4db 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/Views/ChatInteraction/Create.cshtml
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Areas/ChatInteractions/Views/ChatInteraction/Create.cshtml
@@ -92,6 +92,7 @@
                         { "CopilotIsAuth", Model.CopilotIsAuthenticated },
                         { "CopilotUsername", Model.CopilotGitHubUsername },
                         { "CopilotModel", Model.CopilotModel },
+                        { "CopilotReasoningEffort", Model.CopilotReasoningEffort },
                         { "CopilotIsAllowAll", Model.CopilotIsAllowAll },
                         { "CopilotModels", Model.CopilotAvailableModels },
                     })
@@ -99,6 +100,7 @@
                         { "ClaudePrefix", "ci" },
                         { "ClaudeIsConfigured", Model.ClaudeIsConfigured },
                         { "ClaudeModel", Model.ClaudeModel },
+                        { "ClaudeEffortLevel", Model.ClaudeEffortLevel },
                         { "ClaudeModels", Model.AnthropicAvailableModels },
                     })
 
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Views/Shared/_ClaudeConfig.cshtml b/src/Startup/CrestApps.Core.Mvc.Web/Views/Shared/_ClaudeConfig.cshtml
index 47174acb..69e40642 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Views/Shared/_ClaudeConfig.cshtml
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Views/Shared/_ClaudeConfig.cshtml
@@ -3,6 +3,7 @@
     var isConfigured = (bool)(ViewData["ClaudeIsConfigured"] ?? false);
     var anthropicModel = ViewData["ClaudeModel"] as string ?? "";
     var anthropicModels = ViewData["ClaudeModels"] as IEnumerable<Microsoft.AspNetCore.Mvc.Rendering.SelectListItem> ?? [];
+    var effortLevel = (CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel)(ViewData["ClaudeEffortLevel"] ?? CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.None);
     var orchestratorName = CrestApps.Core.AI.Claude.Services.ClaudeOrchestrator.OrchestratorName;
 }
 
@@ -22,7 +23,7 @@
             }
             else if (anthropicModels.Any())
             {
-                <div class="mb-0">
+                <div class="mb-3">
                     <label for="@(prefix)-ClaudeModel" class="form-label">Claude model</label>
                     <select name="ClaudeModel" id="@(prefix)-ClaudeModel" class="form-select">
                         <option value="">Use default model</option>
@@ -33,15 +34,37 @@
                     </select>
                     <div class="form-text">Select a Claude model override for this item, or leave it on the configured default.</div>
                 </div>
+
+                <div class="mb-0">
+                    <label for="@(prefix)-ClaudeEffortLevel" class="form-label">Effort level</label>
+                    <select name="ClaudeEffortLevel" id="@(prefix)-ClaudeEffortLevel" class="form-select">
+                        <option value="@((int)CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.None)" selected="@(effortLevel == CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.None ? "selected" : null)">Default</option>
+                        <option value="@((int)CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.Low)" selected="@(effortLevel == CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.Low ? "selected" : null)">Low</option>
+                        <option value="@((int)CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.Medium)" selected="@(effortLevel == CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.Medium ? "selected" : null)">Medium</option>
+                        <option value="@((int)CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.High)" selected="@(effortLevel == CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.High ? "selected" : null)">High</option>
+                    </select>
+                    <div class="form-text">Select the reasoning effort level. Higher effort produces more thorough responses but uses more tokens.</div>
+                </div>
             }
             else
             {
-                <div class="mb-0">
+                <div class="mb-3">
                     <label for="@(prefix)-ClaudeModel" class="form-label">Claude model</label>
                     <input type="text" name="ClaudeModel" id="@(prefix)-ClaudeModel" class="form-control"
                            value="@anthropicModel" placeholder="Leave empty to use the default model from settings" />
                     <div class="form-text">Optionally override the Claude model. Leave empty to use the default model configured in settings.</div>
                 </div>
+
+                <div class="mb-0">
+                    <label for="@(prefix)-ClaudeEffortLevel" class="form-label">Effort level</label>
+                    <select name="ClaudeEffortLevel" id="@(prefix)-ClaudeEffortLevel" class="form-select">
+                        <option value="@((int)CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.None)" selected="@(effortLevel == CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.None ? "selected" : null)">Default</option>
+                        <option value="@((int)CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.Low)" selected="@(effortLevel == CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.Low ? "selected" : null)">Low</option>
+                        <option value="@((int)CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.Medium)" selected="@(effortLevel == CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.Medium ? "selected" : null)">Medium</option>
+                        <option value="@((int)CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.High)" selected="@(effortLevel == CrestApps.Core.AI.Claude.Models.ClaudeEffortLevel.High ? "selected" : null)">High</option>
+                    </select>
+                    <div class="form-text">Select the reasoning effort level. Higher effort produces more thorough responses but uses more tokens.</div>
+                </div>
             }
         </div>
     </div>
diff --git a/src/Startup/CrestApps.Core.Mvc.Web/Views/Shared/_CopilotConfig.cshtml b/src/Startup/CrestApps.Core.Mvc.Web/Views/Shared/_CopilotConfig.cshtml
index 9f6714a9..b6560aa0 100644
--- a/src/Startup/CrestApps.Core.Mvc.Web/Views/Shared/_CopilotConfig.cshtml
+++ b/src/Startup/CrestApps.Core.Mvc.Web/Views/Shared/_CopilotConfig.cshtml
@@ -8,6 +8,7 @@
       - CopilotIsAuthenticated (bool)
       - CopilotGitHubUsername (string)
       - CopilotModel (string)
+      - CopilotReasoningEffort (enum)
       - CopilotIsAllowAll (bool)
       - CopilotAvailableModels (List<SelectListItem>)
 *@
@@ -21,6 +22,7 @@
     var isAuth = (bool)(ViewData["CopilotIsAuth"] ?? false);
     var username = ViewData["CopilotUsername"] as string ?? "";
     var copilotModel = ViewData["CopilotModel"] as string ?? "";
+    var copilotReasoningEffort = (CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort)(ViewData["CopilotReasoningEffort"] ?? CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.None);
     var isAllowAll = (bool)(ViewData["CopilotIsAllowAll"] ?? false);
     var copilotModels = ViewData["CopilotModels"] as List<Microsoft.AspNetCore.Mvc.Rendering.SelectListItem> ?? [];
     var orchestratorName = CrestApps.Core.AI.Copilot.Services.CopilotOrchestrator.OrchestratorName;
@@ -91,6 +93,17 @@
                     <div class="form-text">Select the Copilot model to use.</div>
                 </div>
 
+                <div class="mb-3 @(isAuth ? "" : "d-none")" id="@(prefix)-copilot-effort-group">
+                    <label for="@(prefix)-CopilotReasoningEffort" class="form-label">Effort level</label>
+                    <select name="CopilotReasoningEffort" id="@(prefix)-CopilotReasoningEffort" class="form-select">
+                        <option value="@((int)CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.None)" selected="@(copilotReasoningEffort == CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.None ? "selected" : null)">Default</option>
+                        <option value="@((int)CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.Low)" selected="@(copilotReasoningEffort == CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.Low ? "selected" : null)">Low</option>
+                        <option value="@((int)CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.Medium)" selected="@(copilotReasoningEffort == CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.Medium ? "selected" : null)">Medium</option>
+                        <option value="@((int)CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.High)" selected="@(copilotReasoningEffort == CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.High ? "selected" : null)">High</option>
+                    </select>
+                    <div class="form-text">Select the reasoning effort level for the Copilot model.</div>
+                </div>
+
                 <div class="mb-3 @(isAuth ? "" : "d-none")" id="@(prefix)-copilot-flags-group">
                     <div class="form-check">
                         <input type="checkbox" name="CopilotIsAllowAll" value="true" class="form-check-input"
@@ -110,6 +123,17 @@
                     <div class="form-text">Optionally override the model name. Leave empty to use the default model configured in Copilot settings.</div>
                 </div>
 
+                <div class="mb-3">
+                    <label for="@(prefix)-CopilotReasoningEffort" class="form-label">Effort level</label>
+                    <select name="CopilotReasoningEffort" id="@(prefix)-CopilotReasoningEffort" class="form-select">
+                        <option value="@((int)CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.None)" selected="@(copilotReasoningEffort == CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.None ? "selected" : null)">Default</option>
+                        <option value="@((int)CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.Low)" selected="@(copilotReasoningEffort == CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.Low ? "selected" : null)">Low</option>
+                        <option value="@((int)CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.Medium)" selected="@(copilotReasoningEffort == CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.Medium ? "selected" : null)">Medium</option>
+                        <option value="@((int)CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.High)" selected="@(copilotReasoningEffort == CrestApps.Core.AI.Copilot.Models.CopilotReasoningEffort.High ? "selected" : null)">High</option>
+                    </select>
+                    <div class="form-text">Select the reasoning effort level for the Copilot model.</div>
+                </div>
+
                 <div class="mb-3">
                     <div class="form-check">
                         <input type="checkbox" name="CopilotIsAllowAll" value="true" class="form-check-input"
@@ -163,6 +187,7 @@
             const usernameEl = document.getElementById(prefix + '-github-username');
             const modelSelect = document.getElementById(prefix + '-CopilotModel');
             const modelGroup = document.getElementById(prefix + '-copilot-model-group');
+            const effortGroup = document.getElementById(prefix + '-copilot-effort-group');
             const flagsGroup = document.getElementById(prefix + '-copilot-flags-group');
 
             const statusUrl = '@Url.Action("Status", "CopilotAuth", new { area = "AIChat" })';
@@ -182,6 +207,7 @@
                 disconnectedEl.classList.toggle('d-none', state !== 'disconnected');
                 loadingEl.classList.toggle('d-none', state !== 'loading');
                 if (modelGroup) modelGroup.classList.toggle('d-none', state !== 'connected');
+                if (effortGroup) effortGroup.classList.toggle('d-none', state !== 'connected');
                 if (flagsGroup) flagsGroup.classList.toggle('d-none', state !== 'connected');
             }
 
@@ -195,7 +221,10 @@
                     models.forEach(function (m) {
                         const opt = document.createElement('option');
                         opt.value = m.id;
-                        opt.textContent = m.name;
+                        const costMultiplier = typeof m.costMultiplier === 'number'
+                            ? m.costMultiplier.toFixed(2).replace(/\.?0+$/, '')
+                            : '';
+                        opt.textContent = m.costMultiplier > 0 ? m.name + ' (x' + costMultiplier + ')' : m.name;
                         modelSelect.appendChild(opt);
                     });
                     if (currentValue && modelSelect.querySelector('option[value="' + CSS.escape(currentValue) + '"]')) {