OPENAI CO-FOUNDER QUITS TO JOIN ANTHROPIC: KARPATHY TAKES AIM AT CLAUDE’S PRETRAINING

Andrej Karpathy, one of the original co-founders of OpenAI and the man who built Tesla’s Autopilot computer vision system, announced Tuesday that he is leaving his education startup Eureka Labs and joining Anthropic to work on Claude’s pre-training. He starts immediately under team lead Nick Joseph and will focus on using Claude itself to accelerate the research that builds future versions of Claude. He said he thinks the next few years at the frontier will be especially formative and he is excited to get back to pure research and development after his stint in AI education.

This is the biggest talent acquisition in the AI industry this year and arguably the most significant defection in the field’s short history. Karpathy helped found OpenAI in 2015, left for Tesla, came back, then left again. He is universally respected in the research community in a way that very few people are. His decision to join Anthropic rather than return to OpenAI signals something real about where serious researchers believe the most important work is happening right now. Anthropic has now pulled in multiple elite researchers in rapid succession. The company that was founded by people worried about moving too fast is now the one everyone wants to work for.

Keywords: Andrej Karpathy Anthropic, OpenAI co-founder 2026, Claude pretraining research, AI talent war