Update default model for Anthropic to Claude Sonnet 4

CHANGELOG.md

@@ -73,6 +73,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Updated the default model for `AnthropicLLMService` to
+  `claude-sonnet-4-20250514`.
+
 - `BaseTextFilter` methods `filter()`, `update_settings()`,
   `handle_interruption()` and `reset_interruption()` are now async.
 

src/pipecat/services/anthropic/llm.py

@@ -90,7 +90,7 @@ class AnthropicLLMService(LLMService):
         self,
         *,
         api_key: str,
-        model: str = "claude-3-7-sonnet-20250219",
+        model: str = "claude-sonnet-4-20250514",
         params: Optional[InputParams] = None,
         client=None,
         **kwargs,