diff --git a/litellm/__init__.py b/litellm/__init__.py
index 60b8cf81a04..0d1ce662c3d 100644
--- a/litellm/__init__.py
+++ b/litellm/__init__.py
@@ -282,6 +282,7 @@ priority_reservation: Optional[Dict[str, float]] = None
 force_ipv4: bool = (
     False  # when True, litellm will force ipv4 for all LLM requests. Some users have seen httpx ConnectionError when using ipv6.
 )
+merge_reasoning_content_in_choices: bool = True
 module_level_aclient = AsyncHTTPHandler(
     timeout=request_timeout, client_alias="module level aclient"
 )
diff --git a/litellm/types/utils.py b/litellm/types/utils.py
index 7e6b95ab154..b118b2634f9 100644
--- a/litellm/types/utils.py
+++ b/litellm/types/utils.py
@@ -21,6 +21,8 @@ from openai.types.moderation_create_response import Moderation, ModerationCreate
 from pydantic import BaseModel, ConfigDict, Field, PrivateAttr
 from typing_extensions import Callable, Dict, Required, TypedDict, override
 
+import litellm
+
 from ..litellm_core_utils.core_helpers import map_finish_reason
 from .guardrails import GuardrailEventHooks
 from .llms.openai import (
@@ -582,6 +584,14 @@ class Delta(OpenAIObject):
         super(Delta, self).__init__(**params)
         add_provider_specific_fields(self, params.get("provider_specific_fields", {}))
         self.content = content
+
+        if litellm.merge_reasoning_content_in_choices:
+            self.content = (
+                (self.content or "") + f"<thinking>{reasoning_content}</thinking>"
+                if reasoning_content
+                else self.content
+            )
+
         self.role = role
         # Set default values and correct types
         self.function_call: Optional[Union[FunctionCall, Any]] = None