diff --git a/Demo/DemoChat/Sources/Extensions/View.swift b/Demo/DemoChat/Sources/Extensions/View.swift
new file mode 100644
index 00000000..4f311176
--- /dev/null
+++ b/Demo/DemoChat/Sources/Extensions/View.swift
@@ -0,0 +1,65 @@
+//
+//  View.swift
+//
+//
+//  Created by James J Kalafus on 2024-02-03.
+//
+
+import SwiftUI
+
+extension View {
+
+    @inlinable public func navigationTitle(_ titleKey: LocalizedStringKey, selectedModel: Binding<String>) -> some View {
+        self
+            .navigationTitle(titleKey)
+            .safeAreaInset(edge: .top) {
+                HStack {
+                    Text(
+                        "Model: \(selectedModel.wrappedValue)"
+                    )
+                    .font(.caption)
+                    .foregroundColor(.secondary)
+                    Spacer()
+                }
+                .padding(.horizontal, 16)
+                .padding(.vertical, 8)
+            }
+    }
+
+    @inlinable public func modelSelect(selectedModel: Binding<String>, models: [String], showsModelSelectionSheet: Binding<Bool>, help: String) -> some View {
+        self
+            .toolbar {
+                ToolbarItem(placement: .navigationBarTrailing) {
+                    Button(action: {
+                        showsModelSelectionSheet.wrappedValue.toggle()
+                    }) {
+                        Image(systemName: "cpu")
+                    }
+                }
+            }
+            .confirmationDialog(
+                "Select model",
+                isPresented: showsModelSelectionSheet,
+                titleVisibility: .visible,
+                actions: {
+                    ForEach(models, id: \.self) { (model: String) in
+                        Button {
+                            selectedModel.wrappedValue = model
+                        } label: {
+                            Text(model)
+                        }
+                    }
+
+                    Button("Cancel", role: .cancel) {
+                        showsModelSelectionSheet.wrappedValue = false
+                    }
+                },
+                message: {
+                    Text(
+                        "View \(help) for details"
+                    )
+                    .font(.caption)
+                }
+            )
+    }
+}
diff --git a/Demo/DemoChat/Sources/UI/DetailView.swift b/Demo/DemoChat/Sources/UI/DetailView.swift
index 3cd119ea..8968ffee 100644
--- a/Demo/DemoChat/Sources/UI/DetailView.swift
+++ b/Demo/DemoChat/Sources/UI/DetailView.swift
@@ -19,7 +19,7 @@ struct DetailView: View {
     @State private var showsModelSelectionSheet = false
     @State private var selectedChatModel: Model = .gpt4_0613
 
-    private let availableChatModels: [Model] = [.gpt3_5Turbo, .gpt4_0613]
+    private static let availableChatModels: [Model] = [.gpt3_5Turbo, .gpt4]
 
     let conversation: Conversation
     let error: Error?
@@ -65,52 +65,8 @@ struct DetailView: View {
 
                     inputBar(scrollViewProxy: scrollViewProxy)
                 }
-                .navigationTitle("Chat")
-                .safeAreaInset(edge: .top) {
-                    HStack {
-                        Text(
-                            "Model: \(selectedChatModel)"
-                        )
-                        .font(.caption)
-                        .foregroundColor(.secondary)
-                        Spacer()
-                    }
-                    .padding(.horizontal, 16)
-                    .padding(.vertical, 8)
-                }
-                .toolbar {
-                    ToolbarItem(placement: .navigationBarTrailing) {
-                        Button(action: {
-                            showsModelSelectionSheet.toggle()
-                        }) {
-                            Image(systemName: "cpu")
-                        }
-                    }
-                }
-                .confirmationDialog(
-                    "Select model",
-                    isPresented: $showsModelSelectionSheet,
-                    titleVisibility: .visible,
-                    actions: {
-                        ForEach(availableChatModels, id: \.self) { model in
-                            Button {
-                                selectedChatModel = model
-                            } label: {
-                                Text(model)
-                            }
-                        }
-
-                        Button("Cancel", role: .cancel) {
-                            showsModelSelectionSheet = false
-                        }
-                    },
-                    message: {
-                        Text(
-                            "View https://platform.openai.com/docs/models/overview for details"
-                        )
-                        .font(.caption)
-                    }
-                )
+                .navigationTitle("Chat", selectedModel: $selectedChatModel)
+                .modelSelect(selectedModel: $selectedChatModel, models: Self.availableChatModels, showsModelSelectionSheet: $showsModelSelectionSheet, help: "https://platform.openai.com/docs/models/overview")
             }
         }
     }
diff --git a/Demo/DemoChat/Sources/UI/TextToSpeechView.swift b/Demo/DemoChat/Sources/UI/TextToSpeechView.swift
index 023548ce..00ef4fe4 100644
--- a/Demo/DemoChat/Sources/UI/TextToSpeechView.swift
+++ b/Demo/DemoChat/Sources/UI/TextToSpeechView.swift
@@ -17,7 +17,11 @@ public struct TextToSpeechView: View {
     @State private var voice: AudioSpeechQuery.AudioSpeechVoice = .alloy
     @State private var speed: Double = AudioSpeechQuery.Speed.normal.rawValue
     @State private var responseFormat: AudioSpeechQuery.AudioSpeechResponseFormat = .mp3
-    
+    @State private var showsModelSelectionSheet = false
+    @State private var selectedSpeechModel: String = Model.tts_1
+
+    private static let availableSpeechModels: [String] = [Model.tts_1, Model.tts_1_hd]
+
     public init(store: SpeechStore) {
         self.store = store
     }
@@ -79,7 +83,7 @@ public struct TextToSpeechView: View {
             Section {
                 HStack {
                     Button("Create Speech") {
-                        let query = AudioSpeechQuery(model: .tts_1,
+                        let query = AudioSpeechQuery(model: selectedSpeechModel,
                                                      input: prompt,
                                                      voice: voice,
                                                      responseFormat: responseFormat,
@@ -93,6 +97,7 @@ public struct TextToSpeechView: View {
                     .disabled(prompt.replacingOccurrences(of: " ", with: "").isEmpty)
                     Spacer()
                 }
+                .modelSelect(selectedModel: $selectedSpeechModel, models: Self.availableSpeechModels, showsModelSelectionSheet: $showsModelSelectionSheet, help: "https://platform.openai.com/docs/models/tts")
             }
             if !$store.audioObjects.wrappedValue.isEmpty {
                 Section("Click to play, swipe to save:") {
@@ -129,7 +134,7 @@ public struct TextToSpeechView: View {
         }
         .listStyle(.insetGrouped)
         .scrollDismissesKeyboard(.interactively)
-        .navigationTitle("Create Speech")
+        .navigationTitle("Create Speech", selectedModel: $selectedSpeechModel)
     }
 }