OpenAI already has a Mythos level model, it's called GPTCyber and before that, it was called gpt-5.5-pro.

No, GPTCyber is specifically trained for cybersecurity, and GPT-5.5-pro is just an ensemble of many subagents, not an actual model.

Mythos is simply a much bigger model in terms of parameters and I don't think OpenAI will have anything of its size anytime soon (My theory is that OpenAI had given up on scaling up parameters after GPT4.5 flopped).

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behnamoh 26 minutes ago | parent [-]

how do you know gpt-5.5-pro is an ensemble? if it is, then how did OpenAI do it? why no other company has been able to pull it off?

	▲	andy12_ 14 minutes ago \| parent [-]
		It's pretty much confirmed by OpenAI here [1]. > We generally treat GPT-5.5’s safety results as strong proxies for GPT-5.5 Pro, which is the same underlying model using a setting that makes use of parallel test time compute. And Gemini also provides something similar. Gemini Deep Think models are pretty much the same thing [2]. As to why no other company uses this, I don't really know. Maybe compute constraints? [1] https://deploymentsafety.openai.com/gpt-5-5 [2] https://deepmind.google/models/gemini/deep-think/