Andrej Karpathy announced his move to Anthropic in a post on X citing the URL https://xcancel.com/karpathy/status/2056753169888334312. Primary source tweet states simply: "I’ve joined Anthropic." The Hacker News discussion at https://news.ycombinator.com/item?id=48194352 logged 614 points and 242 comments on the announcement. Karpathy's prior positions at OpenAI and Tesla AI, documented in his public X history, align with Anthropic's documented emphasis on scalable safety techniques as seen in company technical reports. This follows industry patterns of cross-lab movement tracked in primary X posts from multiple researchers in 2024-2025. Connections to Anthropic's constitutional AI papers and OpenAI's earlier scaling work show direct continuity in focus areas without added interpretation.