From 16b060d9e956f391bdbefd5261377fba77baee98 Mon Sep 17 00:00:00 2001
From: Mark Backman <mark@daily.co>
Date: Wed, 11 Feb 2026 18:04:20 -0500
Subject: [PATCH 1/2] Fix Grok Realtime voice type validation for server
 responses

The Grok API now returns prefixed voice names (e.g. "human_Ara") in
session.updated events, causing Pydantic validation errors. Widen the
voice field type from GrokVoice to GrokVoice | str to accept both
user-facing names and server-returned values.
---
 src/pipecat/services/grok/realtime/events.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pipecat/services/grok/realtime/events.py b/src/pipecat/services/grok/realtime/events.py
index 4069ff927..1f89a92f7 100644
--- a/src/pipecat/services/grok/realtime/events.py
+++ b/src/pipecat/services/grok/realtime/events.py
@@ -216,7 +216,7 @@ class SessionProperties(BaseModel):
     model_config = ConfigDict(arbitrary_types_allowed=True)
 
     instructions: Optional[str] = None
-    voice: Optional[GrokVoice] = "Ara"
+    voice: Optional[GrokVoice | str] = "Ara"
     turn_detection: Optional[TurnDetection] = Field(
         default_factory=lambda: TurnDetection(type="server_vad")
     )

From a9669472202c789232d3170ca37f723ec9b5acd3 Mon Sep 17 00:00:00 2001
From: Mark Backman <mark@daily.co>
Date: Wed, 11 Feb 2026 18:04:58 -0500
Subject: [PATCH 2/2] Add changelog for #3720

---
 changelog/3720.fixed.md | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 changelog/3720.fixed.md

diff --git a/changelog/3720.fixed.md b/changelog/3720.fixed.md
new file mode 100644
index 000000000..c3cb69d34
--- /dev/null
+++ b/changelog/3720.fixed.md
@@ -0,0 +1 @@
+- Fixed Grok Realtime `session.updated` event parsing failure caused by the API returning prefixed voice names (e.g. `"human_Ara"` instead of `"Ara"`).