[low_tech_punk]

I find it strange that GPT-5 is cheaper than GPT-4.1 in input token and is only slightly more expensive in output token. Is it marketing or actually reflecting the underlying compute resources?

[AS04]

Very likely to be an actual reflection. That's probably their real achievement here and the key reason why they are actually publishing it as GPT-5. More or less the best or near to it on everything while being one model, substantially cheaper than the competition.

[ComputerGuru]

But it can’t do audio in/out or image out. Feels like an architectural step back.

[conradkay]

My understanding is that image output is pretty separate and if it doesn’t seem that way, they’re just abstracting several models into one name

[arresin]

Maybe with the router mechanism (to mini or standard) they estimate the average cost will be a lot lower for chatgpt because the capable model won’t be answering dumb questions and then they pass that on to devs?

[low_tech_punk]

I think the router applies to chatgpt app. The developer APIs expose manual control to select the specific model and level of reasoning.