diff --git a/docs/providers/openai.md b/docs/providers/openai.md
index 875fb9e70b7..d41169e5275 100644
--- a/docs/providers/openai.md
+++ b/docs/providers/openai.md
@@ -379,7 +379,7 @@ Legacy `plugins.entries.openai.config.personality` is still read as a compatibil
 
     | Setting | Config path | Default |
     |---------|------------|---------|
-    | Model | `plugins.entries.voice-call.config.realtime.providers.openai.model` | `gpt-realtime` |
+    | Model | `plugins.entries.voice-call.config.realtime.providers.openai.model` | `gpt-realtime-1.5` |
     | Voice | `...openai.voice` | `alloy` |
     | Temperature | `...openai.temperature` | `0.8` |
     | VAD threshold | `...openai.vadThreshold` | `0.5` |
diff --git a/extensions/openai/realtime-voice-provider.test.ts b/extensions/openai/realtime-voice-provider.test.ts
index ea2b1c82a8a..e85a76dac9a 100644
--- a/extensions/openai/realtime-voice-provider.test.ts
+++ b/extensions/openai/realtime-voice-provider.test.ts
@@ -9,7 +9,7 @@ describe("buildOpenAIRealtimeVoiceProvider", () => {
       rawConfig: {
         providers: {
           openai: {
-            model: "gpt-realtime",
+            model: "gpt-realtime-1.5",
             voice: "verse",
             temperature: 0.6,
             silenceDurationMs: 850,
@@ -20,7 +20,7 @@ describe("buildOpenAIRealtimeVoiceProvider", () => {
     });
 
     expect(resolved).toEqual({
-      model: "gpt-realtime",
+      model: "gpt-realtime-1.5",
       voice: "verse",
       temperature: 0.6,
       silenceDurationMs: 850,
diff --git a/extensions/openai/realtime-voice-provider.ts b/extensions/openai/realtime-voice-provider.ts
index e27a734fd61..65446c39fad 100644
--- a/extensions/openai/realtime-voice-provider.ts
+++ b/extensions/openai/realtime-voice-provider.ts
@@ -117,7 +117,7 @@ function base64ToBuffer(b64: string): Buffer {
 }
 
 class OpenAIRealtimeVoiceBridge implements RealtimeVoiceBridge {
-  private static readonly DEFAULT_MODEL = "gpt-realtime";
+  private static readonly DEFAULT_MODEL = "gpt-realtime-1.5";
   private static readonly MAX_RECONNECT_ATTEMPTS = 5;
   private static readonly BASE_RECONNECT_DELAY_MS = 1000;
   private static readonly CONNECT_TIMEOUT_MS = 10_000;