diff --git a/lightllm/server/api_models.py b/lightllm/server/api_models.py
index 1c0403c60..1737d2774 100644
--- a/lightllm/server/api_models.py
+++ b/lightllm/server/api_models.py
@@ -298,14 +298,6 @@ class ChatMessage(BaseModel):
     reasoning_content: Optional[str] = None
     tool_calls: Optional[List[ToolCall]] = Field(default=None, examples=[None])
 
-    @model_validator(mode="after")
-    def _sync_reasoning_aliases(self):
-        if self.reasoning and not self.reasoning_content:
-            self.reasoning_content = self.reasoning
-        elif self.reasoning_content and not self.reasoning:
-            self.reasoning = self.reasoning_content
-        return self
-
 
 class ChatCompletionResponseChoice(BaseModel):
     index: int
@@ -333,14 +325,6 @@ class DeltaMessage(BaseModel):
     reasoning: Optional[str] = None
     reasoning_content: Optional[str] = None
 
-    @model_validator(mode="after")
-    def _sync_reasoning_aliases(self):
-        if self.reasoning and not self.reasoning_content:
-            self.reasoning_content = self.reasoning
-        elif self.reasoning_content and not self.reasoning:
-            self.reasoning = self.reasoning_content
-        return self
-
 
 class ChatCompletionStreamResponseChoice(BaseModel):
     index: int