diff --git a/llama_stack/apis/preprocessing/preprocessing.py b/llama_stack/apis/preprocessing/preprocessing.py
index 440486ef3..780d5ec40 100644
--- a/llama_stack/apis/preprocessing/preprocessing.py
+++ b/llama_stack/apis/preprocessing/preprocessing.py
@@ -8,8 +8,9 @@ from typing import Any, Dict, List, Optional, Protocol, runtime_checkable
 
 from pydantic import BaseModel
 
-from llama_stack.apis.common.content_types import URL
+from llama_stack.apis.common.content_types import URL, InterleavedContent
 from llama_stack.apis.preprocessing.preprocessors import Preprocessor
+from llama_stack.apis.vector_io import Chunk
 from llama_stack.schema_utils import json_schema_type, webmethod
 
 
@@ -28,16 +29,10 @@ class PreprocessingInput(BaseModel):
 PreprocessorOptions = Dict[str, Any]
 
 
-@json_schema_type
-class PreprocessingResult(BaseModel):
-    metadata: dict[str, Any]
-    data: str
-
-
 @json_schema_type
 class PreprocessingResponse(BaseModel):
     status: bool
-    results: Optional[List[str | PreprocessingResult]]
+    results: Optional[List[str | InterleavedContent | Chunk]]
 
 
 class PreprocessorStore(Protocol):
diff --git a/llama_stack/providers/inline/preprocessing/docling/docling.py b/llama_stack/providers/inline/preprocessing/docling/docling.py
index 3de4d9ed9..9305f7d8e 100644
--- a/llama_stack/providers/inline/preprocessing/docling/docling.py
+++ b/llama_stack/providers/inline/preprocessing/docling/docling.py
@@ -13,10 +13,10 @@ from llama_stack.apis.preprocessing import (
     Preprocessing,
     PreprocessingInput,
     PreprocessingResponse,
-    PreprocessingResult,
     Preprocessor,
     PreprocessorOptions,
 )
+from llama_stack.apis.vector_io import Chunk
 from llama_stack.providers.datatypes import PreprocessorsProtocolPrivate
 from llama_stack.providers.inline.preprocessing.docling import InlineDoclingConfig
 
@@ -56,7 +56,7 @@ class InclineDoclingPreprocessorImpl(Preprocessing, PreprocessorsProtocolPrivate
             converted_document = self.converter.convert(url).document
             if self.config.chunk:
                 result = self.chunker.chunk(converted_document)
-                results.extend([PreprocessingResult(data=chunk.text, metadata=chunk.meta) for chunk in result])
+                results.extend([Chunk(content=chunk.text, metadata=chunk.meta) for chunk in result])
             else:
                 result = converted_document.export_to_markdown()
                 results.append(result)