From 6f7664846cace2b4109cd9a207c69deabc700ebc Mon Sep 17 00:00:00 2001
From: Mark Backman <mark@daily.co>
Date: Tue, 24 Feb 2026 12:53:55 -0500
Subject: [PATCH] Add can_generate_metrics to Soniox and AWS Transcribe STT
 services

Commit 859cd7c9 refactored STT TTFB measurement to use the base class
start_ttfb_metrics/stop_ttfb_metrics, which are gated behind
can_generate_metrics(). Soniox and AWS Transcribe never overrode this
method (default returns False), so TTFB was silently never reported.
---
 changelog/3813.fixed.md            | 1 +
 src/pipecat/services/aws/stt.py    | 8 ++++++++
 src/pipecat/services/soniox/stt.py | 8 ++++++++
 3 files changed, 17 insertions(+)
 create mode 100644 changelog/3813.fixed.md

diff --git a/changelog/3813.fixed.md b/changelog/3813.fixed.md
new file mode 100644
index 000000000..9d9115e77
--- /dev/null
+++ b/changelog/3813.fixed.md
@@ -0,0 +1 @@
+- Fixed STT TTFB metrics not being reported for `SonioxSTTService` and `AWSTranscribeSTTService` due to missing `can_generate_metrics()` override.
diff --git a/src/pipecat/services/aws/stt.py b/src/pipecat/services/aws/stt.py
index 09552ecfc..c53e3648c 100644
--- a/src/pipecat/services/aws/stt.py
+++ b/src/pipecat/services/aws/stt.py
@@ -126,6 +126,14 @@ class AWSTranscribeSTTService(WebsocketSTTService):
 
         self._receive_task = None
 
+    def can_generate_metrics(self) -> bool:
+        """Check if this service can generate processing metrics.
+
+        Returns:
+            True, as AWS Transcribe STT supports metrics generation.
+        """
+        return True
+
     def get_service_encoding(self, encoding: str) -> str:
         """Convert internal encoding format to AWS Transcribe format.
 
diff --git a/src/pipecat/services/soniox/stt.py b/src/pipecat/services/soniox/stt.py
index 1e4b49705..61dbb794f 100644
--- a/src/pipecat/services/soniox/stt.py
+++ b/src/pipecat/services/soniox/stt.py
@@ -208,6 +208,14 @@ class SonioxSTTService(WebsocketSTTService):
 
         self._receive_task = None
 
+    def can_generate_metrics(self) -> bool:
+        """Check if this service can generate processing metrics.
+
+        Returns:
+            True, as Soniox STT supports metrics generation.
+        """
+        return True
+
     async def start(self, frame: StartFrame):
         """Start the Soniox STT websocket connection.