If you're talking about the async agent described in the post (already regretting calling it that, let's call it orchestrator agent instead), looks like https://code.claude.com/docs/en/agent-teams is trying to achieve that

Opus[1m] on the API with teams is a very very expensive but very interesting thing to play with, if you're willing to burn a $100 playing with what "state of the art" looks like - I suspect this is it.