LmntTTSService: update the default model to blizzard

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to **Pipecat** will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Changed
+
+- For `LmntTTSService`, changed the default `model` to `blizzard`, LMNT's
+  recommended model.
+
 ## [0.0.76] - 2025-07-11
 
 ### Added

src/pipecat/services/lmnt/tts.py

@@ -95,7 +95,7 @@ class LmntTTSService(InterruptibleTTSService):
         voice_id: str,
         sample_rate: Optional[int] = None,
         language: Language = Language.EN,
-        model: str = "aurora",
+        model: str = "blizzard",
         **kwargs,
     ):
         """Initialize the LMNT TTS service.
@@ -105,7 +105,7 @@ class LmntTTSService(InterruptibleTTSService):
             voice_id: ID of the voice to use for synthesis.
             sample_rate: Audio sample rate. If None, uses default.
             language: Language for synthesis. Defaults to English.
-            model: TTS model to use. Defaults to "aurora".
+            model: TTS model to use. Defaults to "blizzard".
             **kwargs: Additional arguments passed to parent InterruptibleTTSService.
         """
         super().__init__(