diff --git a/vllm/entrypoints/api_server.py b/vllm/entrypoints/api_server.py
index 6127177b4d88..dd7fc025a384 100644
--- a/vllm/entrypoints/api_server.py
+++ b/vllm/entrypoints/api_server.py
@@ -44,11 +44,13 @@ async def generate(request: Request) -> Response:
     The request should be a JSON object with the following fields:
     - prompt: the prompt to use for the generation.
     - stream: whether to stream the results or not.
+    - is_return_prompt: whether to include the prompt in the response.
     - other fields: the sampling parameters (See `SamplingParams` for details).
     """
     request_dict = await request.json()
     prompt = request_dict.pop("prompt")
     stream = request_dict.pop("stream", False)
+    is_return_prompt = request_dict.pop("is_return_prompt", False)
     sampling_params = SamplingParams(**request_dict)
     request_id = random_uuid()
 
@@ -63,7 +65,8 @@ async def stream_results() -> AsyncGenerator[bytes, None]:
             prompt = request_output.prompt
             assert prompt is not None
             text_outputs = [
-                prompt + output.text for output in request_output.outputs
+                (prompt + output.text) if is_return_prompt else output.text
+                for output in request_output.outputs
             ]
             ret = {"text": text_outputs}
             yield (json.dumps(ret) + "\0").encode("utf-8")
@@ -82,9 +85,13 @@ async def stream_results() -> AsyncGenerator[bytes, None]:
     assert final_output is not None
     prompt = final_output.prompt
     assert prompt is not None
-    text_outputs = [prompt + output.text for output in final_output.outputs]
+    text_outputs = [
+        (prompt + output.text) if is_return_prompt else output.text
+        for output in final_output.outputs
+    ]
     ret = {"text": text_outputs}
     return JSONResponse(ret)
+    
 
 
 def build_app(args: Namespace) -> FastAPI: