diff --git a/src/pipecat/services/anthropic/llm.py b/src/pipecat/services/anthropic/llm.py
index fcaed1dfe..2f375df82 100644
--- a/src/pipecat/services/anthropic/llm.py
+++ b/src/pipecat/services/anthropic/llm.py
@@ -1246,7 +1246,7 @@ class AnthropicAssistantContextAggregator(LLMAssistantContextAggregator):
             frame: Frame containing function call result.
         """
         if frame.result:
-            result = json.dumps(frame.result)
+            result = json.dumps(frame.result, ensure_ascii=False)
             await self._update_function_call_result(frame.function_name, frame.tool_call_id, result)
         else:
             await self._update_function_call_result(
diff --git a/src/pipecat/services/aws/llm.py b/src/pipecat/services/aws/llm.py
index 59859abf7..92049dffb 100644
--- a/src/pipecat/services/aws/llm.py
+++ b/src/pipecat/services/aws/llm.py
@@ -691,7 +691,7 @@ class AWSBedrockAssistantContextAggregator(LLMAssistantContextAggregator):
             frame: The function call result frame to handle.
         """
         if frame.result:
-            result = json.dumps(frame.result)
+            result = json.dumps(frame.result, ensure_ascii=False)
             await self._update_function_call_result(frame.function_name, frame.tool_call_id, result)
         else:
             await self._update_function_call_result(
diff --git a/src/pipecat/services/openai/llm.py b/src/pipecat/services/openai/llm.py
index abb3e7eec..553733922 100644
--- a/src/pipecat/services/openai/llm.py
+++ b/src/pipecat/services/openai/llm.py
@@ -255,7 +255,7 @@ class OpenAIAssistantContextAggregator(LLMAssistantContextAggregator):
             frame: Frame containing the function call result.
         """
         if frame.result:
-            result = json.dumps(frame.result)
+            result = json.dumps(frame.result, ensure_ascii=False)
             await self._update_function_call_result(frame.function_name, frame.tool_call_id, result)
         else:
             await self._update_function_call_result(
diff --git a/src/pipecat/services/openai_realtime_beta/openai.py b/src/pipecat/services/openai_realtime_beta/openai.py
index 0a6315986..0d20039b1 100644
--- a/src/pipecat/services/openai_realtime_beta/openai.py
+++ b/src/pipecat/services/openai_realtime_beta/openai.py
@@ -441,7 +441,7 @@ class OpenAIRealtimeBetaLLMService(LLMService):
         item = events.ConversationItem(
             type="function_call_output",
             call_id=frame.tool_call_id,
-            output=json.dumps(frame.result),
+            output=json.dumps(frame.result, ensure_ascii=False),
         )
         await self.send_client_event(events.ConversationItemCreateEvent(item=item))