diff --git a/python/voice-live-avatar/README.md b/python/voice-live-avatar/README.md
index d5fdd94..a526f99 100644
--- a/python/voice-live-avatar/README.md
+++ b/python/voice-live-avatar/README.md
@@ -47,7 +47,7 @@ The avatar feature is currently available in the following service regions: Sout
 
    - `AZURE_VOICELIVE_ENDPOINT` - Your Azure AI Services endpoint
    - `AZURE_VOICELIVE_API_KEY` - Your API key
-   - `VOICELIVE_MODEL` - Model to use (default: `gpt-4o-realtime`)
+   - `VOICELIVE_MODEL` - Model to use (default: `gpt-realtime`)
    - `VOICELIVE_VOICE` - Voice name (default: `en-US-AvaMultilingualNeural`)
 
 3. **Run the server:**
diff --git a/python/voice-live-avatar/app.py b/python/voice-live-avatar/app.py
index 49cadb6..49a4083 100644
--- a/python/voice-live-avatar/app.py
+++ b/python/voice-live-avatar/app.py
@@ -113,7 +113,7 @@ async def health_check():
 async def get_config():
     """Return default configuration to the frontend."""
     return {
-        "model": os.getenv("VOICELIVE_MODEL", "gpt-4o-realtime"),
+        "model": os.getenv("VOICELIVE_MODEL", "gpt-realtime"),
         "voice": os.getenv("VOICELIVE_VOICE", "en-US-AvaMultilingualNeural"),
         "endpoint": os.getenv("AZURE_VOICELIVE_ENDPOINT", ""),
         "hasApiKey": bool(os.getenv("AZURE_VOICELIVE_API_KEY")),
diff --git a/python/voice-live-avatar/static/app.js b/python/voice-live-avatar/static/app.js
index 4cad0ff..61eac0e 100644
--- a/python/voice-live-avatar/static/app.js
+++ b/python/voice-live-avatar/static/app.js
@@ -55,7 +55,11 @@ async function fetchServerConfig() {
         const resp = await fetch('/api/config');
         const config = await resp.json();
         if (config.endpoint) document.getElementById('endpoint').value = config.endpoint;
-        if (config.model) document.getElementById('model').value = config.model;
+        if (config.model) {
+            const modelEl = document.getElementById('model');
+            modelEl.value = config.model;
+            modelEl.dispatchEvent(new Event('change'));
+        }
         if (config.voice) document.getElementById('voiceName').value = config.voice;
     } catch (e) {
         console.log('No server config available, using defaults');
@@ -67,7 +71,17 @@ function setupUIBindings() {
     // Mode change
     document.getElementById('mode').addEventListener('change', updateConditionalFields);
     // Model change
-    document.getElementById('model').addEventListener('change', updateConditionalFields);
+    document.getElementById('model').addEventListener('change', (e) => {
+        const voiceTypeEl = document.getElementById('voiceType');
+        if (e.target.value === 'azure-realtime') {
+            voiceTypeEl.value = 'azure-realtime-native';
+            const nativeEl = document.getElementById('nativeVoiceName');
+            if (nativeEl) nativeEl.value = 'ava';
+        } else if (voiceTypeEl.value === 'azure-realtime-native') {
+            voiceTypeEl.value = 'standard';
+        }
+        updateConditionalFields();
+    });
     // Voice type change
     document.getElementById('voiceType').addEventListener('change', updateConditionalFields);
     // Voice name change
@@ -198,7 +212,11 @@ function updateConditionalFields() {
     const srModel = document.getElementById('srModel').value;
 
     // Cascaded models
-    const cascadedModels = ['gpt-4.1', 'gpt-4.1-mini', 'gpt-4.1-nano', 'gpt-4o', 'gpt-4o-mini', 'phi4-mm', 'phi4-mini'];
+    const cascadedModels = [
+        'gpt-5.4', 'gpt-5.3-chat', 'gpt-5.2', 'gpt-5.2-chat', 'gpt-5.1', 'gpt-5.1-chat',
+        'gpt-5', 'gpt-5-mini', 'gpt-5-nano', 'gpt-5-chat',
+        'gpt-4.1', 'gpt-4.1-mini', 'gpt-4.1-nano', 'gpt-4o', 'gpt-4o-mini',
+    ];
     const isCascaded = cascadedModels.includes(model);
     const isRealtime = model && model.includes('realtime');
 
@@ -229,11 +247,17 @@ function updateConditionalFields() {
     show('standardVoiceField', voiceType === 'standard');
     show('customVoiceFields', voiceType === 'custom');
     show('personalVoiceFields', voiceType === 'personal');
+    show('nativeVoiceField', voiceType === 'azure-realtime-native');
 
     // Voice temperature (DragonHD or personal voice)
     const isDragonHD = voiceName && voiceName.includes('DragonHD');
     const isPersonal = voiceType === 'personal';
-    show('voiceTempField', isDragonHD || isPersonal);
+    show('voiceTempField', voiceType !== 'azure-realtime-native' && (isDragonHD || isPersonal));
+
+    show('voiceSpeedField', voiceType !== 'azure-realtime-native');
+
+    const nativeOpt = document.querySelector('#voiceType option[value="azure-realtime-native"]');
+    if (nativeOpt) nativeOpt.hidden = (model !== 'azure-realtime');
 
     // Avatar settings
     show('avatarSettings', avatarEnabled);
@@ -317,11 +341,15 @@ function gatherConfig() {
 
     const voiceSpeed = parseFloat(document.getElementById('voiceSpeed').value) / 100;
 
+    const voiceName = voiceType === 'azure-realtime-native'
+        ? document.getElementById('nativeVoiceName').value
+        : document.getElementById('voiceName').value;
+
     const config = {
         mode: mode,
         model: model,
         voiceType: voiceType,
-        voiceName: document.getElementById('voiceName').value,
+        voiceName: voiceName,
         voiceSpeed: voiceSpeed,
         voiceTemperature: parseFloat(document.getElementById('voiceTemperature').value),
         voiceDeploymentId: document.getElementById('voiceDeploymentId').value,
diff --git a/python/voice-live-avatar/static/index.html b/python/voice-live-avatar/static/index.html
index 65373b9..b6630a9 100644
--- a/python/voice-live-avatar/static/index.html
+++ b/python/voice-live-avatar/static/index.html
@@ -73,15 +73,25 @@
                         <div id="modelField">
                             <label>Model
                                 <select id="model">
-                                    <option value="gpt-4o-realtime">GPT Realtime</option>
-                                    <option value="gpt-4o-mini-realtime">GPT Realtime Mini</option>
+                                    <option value="gpt-realtime-1.5">GPT Realtime 1.5</option>
+                                    <option value="azure-realtime">Azure Realtime</option>
+                                    <option value="gpt-realtime">GPT Realtime</option>
+                                    <option value="gpt-realtime-mini">GPT Realtime Mini</option>
+                                    <option value="gpt-5.4">GPT-5.4 (Cascaded)</option>
+                                    <option value="gpt-5.3-chat">GPT-5.3 Chat (Cascaded)</option>
+                                    <option value="gpt-5.2">GPT-5.2 (Cascaded)</option>
+                                    <option value="gpt-5.2-chat">GPT-5.2 Chat (Cascaded)</option>
+                                    <option value="gpt-5.1">GPT-5.1 (Cascaded)</option>
+                                    <option value="gpt-5.1-chat">GPT-5.1 Chat (Cascaded)</option>
+                                    <option value="gpt-5">GPT-5 (Cascaded)</option>
+                                    <option value="gpt-5-mini">GPT-5 Mini (Cascaded)</option>
+                                    <option value="gpt-5-nano">GPT-5 Nano (Cascaded)</option>
+                                    <option value="gpt-5-chat">GPT-5 Chat (Cascaded)</option>
                                     <option value="gpt-4.1">GPT-4.1 (Cascaded)</option>
                                     <option value="gpt-4.1-mini">GPT-4.1 Mini (Cascaded)</option>
                                     <option value="gpt-4.1-nano">GPT-4.1 Nano (Cascaded)</option>
                                     <option value="gpt-4o">GPT-4o (Cascaded)</option>
                                     <option value="gpt-4o-mini">GPT-4o Mini (Cascaded)</option>
-                                    <option value="phi4-mm">Phi4-MM Realtime</option>
-                                    <option value="phi4-mini">Phi4 Mini (Cascaded)</option>
                                 </select>
                             </label>
                         </div>
@@ -183,6 +193,7 @@
                                     <option value="standard" selected>Standard Voices</option>
                                     <option value="custom">Custom Voice</option>
                                     <option value="personal">Personal Voice</option>
+                                    <option value="azure-realtime-native">Azure Realtime Native</option>
                                 </select>
                             </label>
 
@@ -251,6 +262,25 @@
                                 </label>
                             </div>
 
+                            <!-- Native Voice (azure-realtime model) -->
+                            <div id="nativeVoiceField" class="voice-variant standard-border" style="display:none">
+                                <label>Voice
+                                    <select id="nativeVoiceName">
+                                        <option value="aarti">Aarti</option>
+                                        <option value="andrew">Andrew</option>
+                                        <option value="ava" selected>Ava</option>
+                                        <option value="denise">Denise</option>
+                                        <option value="elsa">Elsa</option>
+                                        <option value="florian">Florian</option>
+                                        <option value="francisca">Francisca</option>
+                                        <option value="meera">Meera</option>
+                                        <option value="xiaoxiao">Xiaoxiao</option>
+                                        <option value="ximena">Ximena</option>
+                                        <option value="yunxi">Yunxi</option>
+                                    </select>
+                                </label>
+                            </div>
+
                             <!-- Voice Temperature (DragonHD / personal) -->
                             <div id="voiceTempField" style="display:none">
                                 <label>Voice Temperature
diff --git a/python/voice-live-avatar/voice_handler.py b/python/voice-live-avatar/voice_handler.py
index 9feda68..f464520 100644
--- a/python/voice-live-avatar/voice_handler.py
+++ b/python/voice-live-avatar/voice_handler.py
@@ -19,6 +19,7 @@
     AzureSemanticDetection,
     AzureSemanticVad,
     AzureStandardVoice,
+    AzureVoice,
     AudioInputTranscriptionOptions,
     Background,
     ClientEventSessionAvatarConnect,
@@ -69,7 +70,7 @@ async def start(self):
         """Start the Voice Live session."""
         try:
             self.is_running = True
-            model = self.config.get("model", os.getenv("VOICELIVE_MODEL", "gpt-4o-realtime"))
+            model = self.config.get("model", os.getenv("VOICELIVE_MODEL", "gpt-realtime"))
             mode = self.config.get("mode", "model")
 
             # Build connection model string based on mode
@@ -115,7 +116,7 @@ async def _setup_session(self, connection):
         """Configure the Voice Live session with avatar, voice, and other settings."""
         config = self.config
         mode = config.get("mode", "model")
-        model = config.get("model", "gpt-4o-realtime")
+        model = config.get("model", "gpt-realtime")
 
         # Build voice configuration
         voice_config = self._build_voice_config(config)
@@ -255,6 +256,13 @@ def _build_voice_config(self, config: dict):
         voice_temperature = config.get("voiceTemperature", 0.9)
         voice_speed = config.get("voiceSpeed", 1.0)
 
+        if voice_type == "azure-realtime-native":
+            # Native voice names are simple lowercase ids (e.g. "ava"). Reject anything that
+            # looks like a standard voice id (contains "-") so the env default doesn't leak in.
+            client_voice = config.get("voiceName", "")
+            native_name = client_voice if client_voice and "-" not in client_voice else "ava"
+            return AzureVoice({"type": "azure-realtime-native", "name": native_name})
+
         if voice_type == "custom":
             custom_voice_name = config.get("customVoiceName", "")
             deployment_id = config.get("voiceDeploymentId", "")