Allow more flexible assistant and system response (#1256)

python/sglang/srt/openai_api/protocol.py

@@ -200,11 +200,6 @@ class CompletionStreamResponse(BaseModel):
     usage: Optional[UsageInfo] = None
 
 
-class ChatCompletionMessageGenericParam(BaseModel):
-    role: Literal["system", "assistant"]
-    content: str
-
-
 class ChatCompletionMessageContentTextPart(BaseModel):
     type: Literal["text"]
     text: str
@@ -225,6 +220,11 @@ ChatCompletionMessageContentPart = Union[
 ]
 
 
+class ChatCompletionMessageGenericParam(BaseModel):
+    role: Literal["system", "assistant"]
+    content: Union[str, List[ChatCompletionMessageContentTextPart]]
+
+
 class ChatCompletionMessageUserParam(BaseModel):
     role: Literal["user"]
     content: Union[str, List[ChatCompletionMessageContentPart]]