Andrew Curran at X:
After using Fable, it now seems clearer than ever to me that the shift we felt was driven not only by tool advances in Claude Code and Codex, but by Mythos emerging from its training run in early February. Mythos will have many children, and the resulting boost to internal development has changed the shape of the race.
I am not saying the race is over. It is not. The other big labs will train models just as capable – I’m sure some already are. Eventually they will divine the magic Anthropic put into Mythos and replicate it. But the race is over for some people. The frontier is now an accelerating system in which the leading models will help produce the next leading models. That we would reach this threshold has been predicted by many people for years. It has now been crossed.
More here.
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