Andrej Karpathy joins Anthropic to help launch a team focused on using Claude to accelerate pre-training research; he helped found OpenAI and worked at Tesla (Madison Mills/Axios)

Madison Mills / Axios: Andrej Karpathy joins Anthropic to help launch a team focused on using Claude to accelerate pre-training research; he helped found OpenAI and worked at Tesla — 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.