An OpenAI co-founder has joined the competition. Andrej Karpathy, who helped start the high-profile artificial intelligence outfit in 2015, has now joined Anthropic, he announced Tuesday. Karpathy was instrumental in the development of Tesla's Autopilot system, working for the automaker for about five years in between two separate stints at OpenAI. In his new role at rival Anthropic, Karpathy will "get back to R&D," he wrote in a social media post, adding, "I think the next few years at the frontier of LLMs will be especially formative."