OpenAI co-founder Andrej Karpathy joins Anthropic

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.

Why it matters: The hire is a major coup for Anthropic in the high-stakes competition for elite AI talent — and another sign the company is emerging as a magnet for some of the industry's most respected technical minds.

Driving the news: 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.

• Karpathy will help launch a new team focused on using Claude itself to accelerate pretraining research — an increasingly important frontier as AI companies race to automate parts of AI development.
• "I think the next few years at the frontier of LLMs will be especially formative. I am very excited to join the team here and get back to R&D," Karpathy said in a post on X.

Between the lines: Karpathy is a rare AI figure with credibility across research, industry and education.

• He was a founding member of OpenAI before serving as Tesla's director of AI, where he led the computer vision team behind Autopilot.
• Karpathy coined the term "vibe coding" and recently described himself as being in a "state of AI psychosis" since December — embracing "tokenmaxxing" and aggressively stress-testing frontier models.

Zoom out: Since leaving Tesla in 2022, Karpathy has become one of AI's most influential public educators, building a massive following through technical explainers and educational content on YouTube and X.

• He said Tuesday that he remains "deeply passionate about education" and plans to return to that work "in time."

The bottom line: The AI race is often framed around massive funding rounds and scarce computing power. Just as important is the fierce competition for the small pool of researchers — like Karpathy — capable of advancing the frontier.