OpenAI co-founder Andrej Karpathy joins Anthropic’s pre-training team

May 19, 2026 - 19:30
OpenAI co-founder Andrej Karpathy joins Anthropic’s pre-training team
Pre-training is responsible for the large-scale training runs that give Claude its core knowledge and capabilities, according to the company. It's also one of the most expensive, compute-intensive phases of building a frontier model.