I know that one can use AsyncOpenAI for concurrent queries to GPT/chat models, but does it also work for concurrent image generation?

I'm trying to use the following within an async function for generating multiple images concurrently (and called by another async looper to run multiple of these concurrently):
await dalleclient.images.generate() # where dalleclient is an AsyncOpenAI()

But I notice the image requests seem to be getting sent and processed sequentially, i.e. each image is only initiated when the previous one is completed.

Am I doing something wrong, or is AsyncOpenAI only meant for concurrent GPT/chat use?

Thanks!!