Andrej Karpathy, one of the best-known AI researchers in the world and a founding member of OpenAI, announced Tuesday that he's joining rival AI lab Anthropic.Why it matters: The hire is a major coup for Anthropic in the high-stakes competition for elite AI talent — and another sign the company is emerging as a magnet for some of the industry's most respected technical minds.Driving the news: Karpathy will start this week on Anthropic's pre-training team, which is responsible for the massive tra...