Update OpenAILLMService and OpenPipeLLMService to use gpt-4.1 by default

CHANGELOG.md

@@ -20,6 +20,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- `OpenAILLMService` and `OpenPipeLLMService` now use `gpt-4.1` as their
+  default model.
+
 - `SoundfileMixer` constructor arguments need to be keywords.
 
 ### Fixed

src/pipecat/services/openai/llm.py

@@ -38,7 +38,7 @@ class OpenAILLMService(BaseOpenAILLMService):
     def __init__(
         self,
         *,
-        model: str = "gpt-4o",
+        model: str = "gpt-4.1",
         params: BaseOpenAILLMService.InputParams = BaseOpenAILLMService.InputParams(),
         **kwargs,
     ):

src/pipecat/services/openpipe/llm.py

@@ -25,7 +25,7 @@ class OpenPipeLLMService(OpenAILLMService):
     def __init__(
         self,
         *,
-        model: str = "gpt-4o",
+        model: str = "gpt-4.1",
         api_key: Optional[str] = None,
         base_url: Optional[str] = None,
         openpipe_api_key: Optional[str] = None,