MacKenzie Sigalos / CNBC:PitchBook: in H1, AI startups raised $104.3B in the US, or about 66% of all US VC funding, up from 49% last year; there were 281 VC-backed exits totaling $36B — OpenAI and Anthropic continue to lead a fundraising bonanza in artificial intelligence, raising historic rounds and stratospheric valuations.