OpenAI is engaged on one more AI mannequin reportedly known as GPT-4.1, a successor to GPT-4o, which is anticipated to come earlier than GPT 5.0
The Verge just lately reported that OpenAI plans to launch GPT-4.1, which is an improve to the prevailing GPT-4o. And now, now we have extra causes to consider the mannequin is certainly coming.
As noticed by AI researcher Tibor Blaho, OpenAI is already testing mannequin artwork for o3, o4-mini, and GPT-4.1 (together with nano and mini variants) on the OpenAI API platform.

This confirms that GPT-4.1 does exist, nevertheless it does not look like a successor to GPT-4.5.
My understanding is that GPT-4.1 is a successor to GPT-4o, which is multimodal. Alternatively, GPT-4.5 focuses extra on creativity and delivering higher solutions.
In a “Pre-Coaching GPT-4.5” video from OpenAI, founder and CEO Sam Altman dropped hints that OpenAI has a crew that wishes to redo GPT-4 from scratch utilizing new coaching information and methods.
“If you happen to guys may go choose whoever you wished, what’s the smallest crew from OpenAI that would go retrain GPT-4 from scratch at present with all the things we all know and have and all of the methods work?” Sam stated.
It is unclear if Altman is referring to the brand new GPT-4.1 mannequin, but when I had been to guess, I would guess on GPT-4.1.
Additionally, GPT-5 is not taking place anytime quickly, as OpenAI plans to give attention to o3, o4-mini, o4-mini-high, and GPT-4.1 (together with nano and mini variants).