Framing GPT 5 as a loss because of its short run like that is a bit weird. They say "the R&D that went into GPT-5 likely informs future models like GPT-6". but that really understates what is happening here.

Barring solid evidence otherwise you would think that GPT 5.2 was built largely on GPT 5, enough that possibly the majority of the cost of 5.2 was in developing GPT 5.

It would be like if you shipped something v1.0 on day one and discovered a bug and shipped something v1.01 the next day. Then at the end of the year reported that v1.0 massively lost money but you wouldn't believe the profit we made on v1.01 it was the single largest return on a single day of development we've ever seen.