No, GPT-4o has not been renamed to gpt-5-main. gpt-5-main is an entirely new model.

I suggest comparing https://platform.openai.com/docs/models/gpt-5 and https://platform.openai.com/docs/models/gpt-4o to understand the differences in a more readable way than that system card.

  GPT-5:
  400,000 context window
  128,000 max output tokens
  Sep 30, 2024 knowledge cutoff
  Reasoning token support

  GPT-4o:
  128,000 context window
  16,384 max output tokens
  Sep 30, 2023 knowledge cutoff

Also note that I said "consumer ChatGPT account". The API is different. (I added a clarification note to my post about that since first publishing it.)

▲ AndrewKemendo 5 days ago | parent [-]

You can't compare them like that

GPT-5 isn't the successor to 4o no matter what they say, GPT-5 is a MOE handler on top of multiple "foundations", it's not a new model, it's orchestration of models based on context fitting

You're buying the marketing bullshit as though it's real

	▲	simonw 5 days ago \| parent [-]
		No, there are two things called GPT-5 (this is classic OpenAI, see also Codex). There's GPT-5 the system, a new model routing mechanism that is part of their ChatGPT consumer product. There's also a new model called GPT-5 which is available via their API: https://platform.openai.com/docs/models/gpt-5 (And two other named API models, GPT-5 mini and GPT-5 nano - part of the GPT-5 model family). AND there's GPT-5 Pro, which isn't available via the API but can be accessed via ChatGPT for $200/month subscribers.