diff --git a/changelog/4429.changed.md b/changelog/4429.changed.md
new file mode 100644
index 000000000..11464fb48
--- /dev/null
+++ b/changelog/4429.changed.md
@@ -0,0 +1 @@
+- Changed the default model for `GrokLLMService` from `grok-3` to `grok-4.20-non-reasoning`. xAI is retiring `grok-3` on May 15, 2026.
diff --git a/src/pipecat/services/xai/llm.py b/src/pipecat/services/xai/llm.py
index e0d84373f..1e7656f06 100644
--- a/src/pipecat/services/xai/llm.py
+++ b/src/pipecat/services/xai/llm.py
@@ -56,7 +56,7 @@ class GrokLLMService(OpenAILLMService):
         Args:
             api_key: The API key for accessing Grok's API.
             base_url: The base URL for Grok API. Defaults to "https://api.x.ai/v1".
-            model: The model identifier to use. Defaults to "grok-3".
+            model: The model identifier to use. Defaults to "grok-4.20-non-reasoning".
 
                 .. deprecated:: 0.0.105
                     Use ``settings=GrokLLMService.Settings(model=...)`` instead.
@@ -67,7 +67,7 @@ class GrokLLMService(OpenAILLMService):
         """
         # 1. Initialize default_settings with hardcoded defaults
         default_settings = self.Settings(
-            model="grok-3",
+            model="grok-4.20-non-reasoning",
         )
 
         # 2. Apply direct init arg overrides (deprecated)