I agree. OpenAI claimed in the gpt-4o blog post that it is an entirely new model trained from the ground up. GPT-N refers to capabilities, not a specific architecture or set of weights. I imagine GPT-5 will likely be an upscaled version of 4o, as the success of 4o has revealed that multi-modal training can reach similar capabilities at what is likely a smaller number of weights (judging by the fact that gpt-4o is cheaper and faster than 4 and 4T)
I agree. OpenAI claimed in the gpt-4o blog post that it is an entirely new model trained from the ground up. GPT-N refers to capabilities, not a specific architecture or set of weights. I imagine GPT-5 will likely be an upscaled version of 4o, as the success of 4o has revealed that multi-modal training can reach similar capabilities at what is likely a smaller number of weights (judging by the fact that gpt-4o is cheaper and faster than 4 and 4T)