diff --git a/source/api_definitions.py b/source/api_definitions.py
index e5697f86f..0f73cc8d3 100644
--- a/source/api_definitions.py
+++ b/source/api_definitions.py
@@ -283,23 +283,18 @@ class FilteringFunction(Enum):
 class SyntheticDataGenerationRequest:
     """Request to generate synthetic data. A small batch of prompts and a filtering function"""
 
-    prompts: List[str]
+    prompts: List[Message]
     filtering_function: FilteringFunction = FilteringFunction.none
-
-    # TODO(ragho): fix this
-    # reward_scoring: RewardScoring
+    reward_scoring: Optional[RewardScoring] = None
 
 
 @json_schema_type
 @dataclass
 class SyntheticDataGenerationResponse:
-    """Response from the synthetic data generation. Batch of (prompt, response, score) tuples that pass the threshold."""
+     """Response from the synthetic data generation. Batch of (prompt, response, score) tuples that pass the threshold."""
 
-    synthetic_data: List[Tuple[str, str, float]]
-
-    """The actual synthetic data"""
-    statistics: Dict[str, float]
-    """Statistics on how many prompts were generated and how many were filtered out"""
+     synthetic_data: List[KScoredPromptGenerations]
+     statistics: Optional[Dict[str, Any]] = None
 
 
 class SyntheticDataGeneration(Protocol):