Blocking the event loop since 3.x ?

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

We run a service using a standard asyncio event loop, running various async code like aiokafka, redis (async) or aiohttp. After upgrading to 3.x version, we notice after a while symptoms that the event loop is blocked:

• timeout accessing redis
• timeout with the aiokafka coordinator/heartbeat co-routine

We tried using the default httpx2 client or httpx2 aiohttp client, but it doesn't solve the issue. Reverting to 2.54 solves the issue

Sorry to be so vague, we have nothing in our logs that could give a pointer to a more precise section of the code. We do use chat completion APIs, and structured output with Pydantic

To Reproduce

1. Update to 3.x
2. Wait few hours, the CPU usage is raising, symptom of blocked event loop appears

Code snippets

OS

Linux x86

Python version

Python v3.12.3

Library version

OpenAI v3.6.0

Start by reproducing the upgrade from version 2.54 to 3.6.0 in a Python asyncio service using chat completions or structured outputs, while monitoring CPU and event-loop responsiveness. Compare the default httpx client with the httpx aiohttp client and verify whether Redis, aiokafka, or other async operations still time out after several hours.