Deprecation of fine tuned models, but still can't access newer ones?

Well, this is very uncool. We’re using nano specifically because the response times are much better. gpt-5-nano absolutely will not do our classification correctly without fine tuning. We all know that gpt-5 fine tuning exists and a bunch of people have access to it already (people have published papers!). Why can’t the rest of us start fine tuning on gpt-5 (nanon/mini/regular)?