From a71f937e8f2b11d9e519b262f452915ea90e9900 Mon Sep 17 00:00:00 2001
From: Mark Backman <mark@daily.co>
Date: Tue, 30 Sep 2025 08:49:30 -0400
Subject: [PATCH] Update AnthropicLLMService to use claude-sonnet-4-5-20250929

---
 CHANGELOG.md                          | 5 +++++
 src/pipecat/services/anthropic/llm.py | 4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4c928028f..05a53fc44 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Include OpenAI-based LLM services cached tokens to `MetricsFrame`.
 
+### Changed
+
+- Updated the default model for `AnthropicLLMService` to
+  `claude-sonnet-4-5-20250929`.
+
 ## Fixed
 
 - Fixed an issue where local SmartTurn was not being ran in a separate thread.
diff --git a/src/pipecat/services/anthropic/llm.py b/src/pipecat/services/anthropic/llm.py
index b5328be50..0adc2a0d1 100644
--- a/src/pipecat/services/anthropic/llm.py
+++ b/src/pipecat/services/anthropic/llm.py
@@ -151,7 +151,7 @@ class AnthropicLLMService(LLMService):
         self,
         *,
         api_key: str,
-        model: str = "claude-sonnet-4-20250514",
+        model: str = "claude-sonnet-4-5-20250929",
         params: Optional[InputParams] = None,
         client=None,
         retry_timeout_secs: Optional[float] = 5.0,
@@ -162,7 +162,7 @@ class AnthropicLLMService(LLMService):
 
         Args:
             api_key: Anthropic API key for authentication.
-            model: Model name to use. Defaults to "claude-sonnet-4-20250514".
+            model: Model name to use. Defaults to "claude-sonnet-4-5-20250929".
             params: Optional model parameters for inference.
             client: Optional custom Anthropic client instance.
             retry_timeout_secs: Request timeout in seconds for retry logic.