diff --git a/changelog/3531.changed.md b/changelog/3531.changed.md
new file mode 100644
index 000000000..326d8d4d1
--- /dev/null
+++ b/changelog/3531.changed.md
@@ -0,0 +1,2 @@
+- Changed default Inworld TTS model from `inworld-tts-1` to                      
+ `inworld-tts-1.5-max`.
diff --git a/src/pipecat/services/inworld/tts.py b/src/pipecat/services/inworld/tts.py
index 38617ac15..4e6ec3f4e 100644
--- a/src/pipecat/services/inworld/tts.py
+++ b/src/pipecat/services/inworld/tts.py
@@ -72,7 +72,7 @@ class InworldHttpTTSService(WordTTSService):
         api_key: str,
         aiohttp_session: aiohttp.ClientSession,
         voice_id: str = "Ashley",
-        model: str = "inworld-tts-1",
+        model: str = "inworld-tts-1.5-max",
         streaming: bool = True,
         sample_rate: Optional[int] = None,
         encoding: str = "LINEAR16",
@@ -427,7 +427,7 @@ class InworldTTSService(AudioContextWordTTSService):
         *,
         api_key: str,
         voice_id: str = "Ashley",
-        model: str = "inworld-tts-1",
+        model: str = "inworld-tts-1.5-max",
         url: str = "wss://api.inworld.ai/tts/v1/voice:streamBidirectional",
         sample_rate: Optional[int] = None,
         encoding: str = "LINEAR16",