vector_stores not exposed in SDK 1.78.0 beta.client despite official release

[Moondy217]

Describe the bug

Summary

I'm trying to use the new vector store support in OpenAI's Assistants API (file_search with vector_store_ids), but the Python SDK (v1.78.0) does not expose the vector_stores attribute under client.beta.

What I expected

According to the documentation, I should be able to:

vector_store = client.beta.vector_stores.create(name="My Vector Store")

And use it with:

tools=[{"type": "file_search"}],
tool_resources={"file_search": {"vector_store_ids": [vector_store.id]}}

What happened

However, the following fails:

"vector_stores" in dir(client.beta)  # returns False
client.beta.vector_stores  # AttributeError

>>> print(dir(client.beta))
['__annotations__', '__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getstate__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_client', '_delete', '_get', '_get_api_list', '_patch', '_post', '_put', '_sleep', 'assistants', 'chat', 'realtime', 'threads', 'with_raw_response', 'with_streaming_response']

No vector_store

The SDK version is:

Name: openai
Version: 1.78.0

I've tried installing from main, clearing cache, and reinstalling — the attribute is still missing.

Expected outcome

It would be great to:

expose vector_stores under client.beta
provide example usage (as shown in API reference)
clarify whether SDK support is delayed or upcoming

To Reproduce

1. Install the latest SDK (1.78.0) or try development versions:

pip install --no-cache-dir openai==1.78.0

pip install --no-cache-dir git+https://github.com/openai/openai-python.git@a790e6e

pip install --no-cache-dir git+https://github.com/openai/openai-python.git@6c6e17679a6f90dd15e58b13d85e0b2e8bb5f209

pip install --no-cache-dir https://github.com/openai/openai-python/archive/refs/heads/main.zip

2. Initialize the client:

from openai import OpenAI
client = OpenAI(api_key="sk-...")  # My valid API key

3. Try to access vector stores:

print("vector_stores" in dir(client.beta))  # Expected: True, Got: False
print(client.beta.vector_stores)  # Raises: AttributeError

OS

macOS

Python version

Python v3.11

Library version

openai v1.78.0