ChatGPT's image generator has been able to do this since last year. That NBP still can't is baffling. They should at least train it to respond to requests for transparency with a solid colour pink background.

▲

vunderba 25 minutes ago | parent [-]

This. Gpt-image-1/1.5 are the only ones that have this built in - though I'd love to have an insider view if its natively considering the alpha channel or just feeding it through a rembg-style post processor.

	▲	RobinL 9 minutes ago \| parent [-]
		Certainly the initial versions were post processing rather than native. I'd be interested to know if that has changed on subsequent releases.