chunking_strategy at vector store level is not being applied to files.

[rakeshsilswal]

Confirm this is an issue with the Python library and not an underlying OpenAI API

• This is an issue with the Python library

Describe the bug

I have created vector store with

new_store = await self.client.vector_stores.create( name=name, expires_after={"anchor": "last_active_at", "days": expires_days}, chunking_strategy={ "type": "static", "static": { "max_chunk_size_tokens": max_chunk_size_tokens, "chunk_overlap_tokens": chunk_overlap_tokens } } )

when i am uploading files with upload_and_poll, and retrieving file attribute, i am getting (with default chunk size).

VectorStoreFile(id='assistant-MX3yjwZooLxymkJMWE217V', created_at=1748104237, last_error=None, object='vector_store.file', status='completed', usage_bytes=65486, vector_store_id='vs_ajzhAjwMLVQoqYGfAFC4T5LX', attributes=None, chunking_strategy=StaticFileChunkingStrategyObject(static=StaticFileChunkingStrategy(chunk_overlap_tokens=400, max_chunk_size_tokens=800), type='static'))

and when i am passing chunking_strategy to upload_and_poll. it is getting applied correctly.

To Reproduce

1. create vector store with chunking_strategy
2. upload file using upload_and_poll. do not pass chunking_strategy
3. retrieve file propertied using "client.vector_stores.files.retrieve"
4. you will observe static=StaticFileChunkingStrategy(chunk_overlap_tokens=400, max_chunk_size_tokens=800)

Code snippets

OS

windows

Python version

3.11.11

Library version

openai v1.82.0