diff --git a/backend/apps/audio/main.py b/backend/apps/audio/main.py
index 699d3b9ad..663e20c97 100644
--- a/backend/apps/audio/main.py
+++ b/backend/apps/audio/main.py
@@ -199,6 +199,14 @@ async def speech(request: Request, user=Depends(get_verified_user)):
     headers["Authorization"] = f"Bearer {app.state.config.TTS_OPENAI_API_KEY}"
     headers["Content-Type"] = "application/json"
 
+    try:
+        body = body.decode("utf-8")
+        body = json.loads(body)
+        body["model"] = app.state.config.TTS_MODEL
+        body = json.dumps(body).encode("utf-8")
+    except Exception as e:
+        pass
+
     r = None
     try:
         r = requests.post(
diff --git a/src/lib/apis/audio/index.ts b/src/lib/apis/audio/index.ts
index 7bd8981fe..9716c552a 100644
--- a/src/lib/apis/audio/index.ts
+++ b/src/lib/apis/audio/index.ts
@@ -98,7 +98,7 @@ export const synthesizeOpenAISpeech = async (
 	token: string = '',
 	speaker: string = 'alloy',
 	text: string = '',
-	model: string = 'tts-1'
+	model?: string
 ) => {
 	let error = null;
 
@@ -109,9 +109,9 @@ export const synthesizeOpenAISpeech = async (
 			'Content-Type': 'application/json'
 		},
 		body: JSON.stringify({
-			model: model,
 			input: text,
-			voice: speaker
+			voice: speaker,
+			...(model && { model })
 		})
 	})
 		.then(async (res) => {
diff --git a/src/lib/components/chat/MessageInput/CallOverlay.svelte b/src/lib/components/chat/MessageInput/CallOverlay.svelte
index 25c68a1e3..f35f320ab 100644
--- a/src/lib/components/chat/MessageInput/CallOverlay.svelte
+++ b/src/lib/components/chat/MessageInput/CallOverlay.svelte
@@ -170,8 +170,7 @@
 		const res = await synthesizeOpenAISpeech(
 			localStorage.token,
 			$settings?.audio?.tts?.voice ?? $config?.audio?.tts?.voice,
-			text,
-			$settings?.audio?.tts?.model ?? $config?.audio?.tts?.model
+			text
 		).catch((error) => {
 			toast.error(error);
 			assistantSpeaking = false;
@@ -267,8 +266,7 @@
 				const res = await synthesizeOpenAISpeech(
 					localStorage.token,
 					$settings?.audio?.tts?.voice ?? $config?.audio?.tts?.voice,
-					sentence,
-					$settings?.audio?.tts?.model ?? $config?.audio?.tts?.model
+					sentence
 				).catch((error) => {
 					toast.error(error);
 
diff --git a/src/lib/components/chat/Messages/ResponseMessage.svelte b/src/lib/components/chat/Messages/ResponseMessage.svelte
index 11eaa754d..8c9ac7b4c 100644
--- a/src/lib/components/chat/Messages/ResponseMessage.svelte
+++ b/src/lib/components/chat/Messages/ResponseMessage.svelte
@@ -245,8 +245,7 @@
 					const res = await synthesizeOpenAISpeech(
 						localStorage.token,
 						$settings?.audio?.tts?.voice ?? $config?.audio?.tts?.voice,
-						sentence,
-						$settings?.audio?.tts?.model ?? $config?.audio?.tts?.model
+						sentence
 					).catch((error) => {
 						toast.error(error);