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when they say "claude" what model do they mean ?

no mention of opus/mythos/fable or anything..

seems like mythos 5 did most of the leg work, they refer to it in the technical report linked at the end: https://www-cdn.anthropic.com/22573675ada52a8ca8a97a1a4b4326...

It could be an internal model as well.

Could also just be hired specialists internally and it's pure marketing (even if they discovered something new).

lol, it's true, Claude in the article is so anthropomorphized that you could read it as if it was a human just as well.