The newsletter reported on 20 May 2026 that Karpathy had joined Anthropic under Nick Joseph to lead pre-training, titling the item ‘The recursive loop acquires a job title’. Every earlier Karpathy item in the corpus, from the magnitude 9 earthquake to Claude running nanochat, predates this appointment; from this point his statements are those of a frontier-lab insider.
Role
Andrej Karpathy, pre-training lead at Anthropic
The position he took in May 2026, reporting to Nick Joseph, which the newsletter glossed as training Claude to accelerate Claude.
Sources
Attribution and reporting linked by this record; links do not imply independent verification.
- Welcome to December 27, 2025 (theinnermostloop.substack.com)
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