Claude's new checkpoint leaks that Karpathy joined Anthropic's pretraining team in May 2026
ChrisGPT · x · 2026-11-08
User @ChrisGPT found that a new Claude checkpoint (Fable/Opus, Sonnet 5.5 Extra) answers "where did Karpathy go in 2026" without web access: it says he joined Anthropic's pretraining team in May 2026 to speed up pretraining research with Claude, after Eureka Labs. The result reproduced across three accounts; Opus reproduced it once. Suggests Sonnet Extra is being routed to the newest checkpoint more often. Unverified rumor — the model itself says "verify before you post."
Related event: Claude Checkpoint Appears to Know Karpathy Joined Anthropic in 2026(4 posts)→
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