It depends. If Mythos is AGI then OpenAI's charter says they have to merge with the winner.

And I have a bridge to sell you...

There is obviously tons of leeway it who gets to say what is "AGI", and so far it seems like OpenAI's charter isn't worth the paper it's printed on. I still find it funny that Altman and Amodei couldn't even bring themselves to hold hands at that AI summit, https://www.reddit.com/r/ClaudeAI/comments/1r8ua2j/sam_altma... , so I'm getting a chuckle at the thought that Altman would be like "Whelp, close er up, boys, Amodei won, so time to merge..."