Given a lot of political pressures, i think it's somewhat plausible for there not to be any model called GPT-5, that openAI just releases upgraded ChatGPTs. Maybe they work only on multimodal models from now on and never release any pure large language model again, etc. and discontinue the GPT series.

Will there be a large language model titled officially as GPT-5 

 by OpenAI? It can be a multimodal model called GPT-5, or it can be a language only model called GPT-5. The question is whether they will discontinue this particular series and do something different, as ex: Gobi, arrakis etc suggest.

In case OpenAI splits up etc, i will make changes at the time to reflect the resolution criteria better.

i think it's less likely that they release it named as a GPT-5 if they're moving away from pure language models, but if they do release a multimodel GPT-5, then it counts