Karpathy will start this week on Anthropic's pre-training team, which is responsible for the massive training runs that give Claude its core knowledge and capabilities, according to Anthropic.
Source: https://www.axios.com/2026/05/19/anthropic-openai-karpathy-a...
This is good branding move for Anthropic. Karpathy is well respected among ML crowd.
Why do they need this when they have the next gen mythos? Surely that can manage everything?
Specifically it looks like he's planning to extend the ideas from https://github.com/karpathy/autoresearch into a larger effort towards recursive training improvement [1]:
> Excited to welcome Andrej to the Pretraining team! He'll be building a team focused on using Claude to accelerate pretraining research itself. I can’t think of anyone better suited to do it — looking forward to what we build together!
[1] https://x.com/nickevanjoseph/status/2056760504949842219