I believe Anthropic is already doing Level 3 vibe coding for >90% of their code.

They have not said that. They've only said that most of their code is written by Claude. That is different than "vibe coding". If competent engineers review the code then it is little different than any coding.

	▲	xcodevn 9 hours ago \| parent [-]
		IIRC, the Claude Code creator mentioned that all the PRs are reviewed by humans, just like normal human PRs. So yes, humans still look at the code at the review stage. Though I still consider this to be level 3, but anyway, this is just a matter of definition.