> At Tesla he had a way lower profile.

?

He was literally rolled out in front of camera as Tesla's AI prodigy at multiple streamed events designed to appeal to techy consumers and dev recruitment. He's definitely been one of AI's public personas for a long time now, and his employers have regularly aided/directed/utilized him accordingly.

I think he's just genuinely excited about the capabilities.

(I do understand that for Anthropic it's a brand boost as well, just like signing other prominent researchers, as it was with LeCun and Meta etc).