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There's an entire video in the post dedicated to how well it does transparency: https://openai.com/index/introducing-4o-image-generation/?vi...

I suspect we're getting a flood of comment from people who are using Dall-E.

The video was helpful. I started with the prompt "Generate a transparent image. "

And that created the isolated image on a transparent background.

Thank-you.

Huh, I missed that. I'm skeptical of the results in practice, though.

This one however explicitly advertises good transparency support.

There's a mod for stable diffusion webui forge/automatic1111/ComfyUI which enables this for all diffusion models (except these closed source ones).

SD extensions like rembg are post-processing effects - with their video transparency demo I'd be curious if 4o actually did training with an alpha channel.