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Last week we released NanoGPT Slowrun , an open repo for data-efficient learning algorithms. The rules are simple: train on 100M tokens from FineWeb, use as much compute as you want, lowest validation loss wins. Improvements are submitted as PRs to the repo and merged if they lower val loss. The constraint is the inverse of speedruns like modded-nanogpt , which optimize wall-clock time. Those benchmarks have been hugely productive, but optimizing for speed filters out expensive ideas: heavy regularization, second-order optimizers, gradient descent alternatives. Slowrun is built for exactly those ideas.

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Phipps said JetStream’s early customer work suggests the reality is usually worse than they think. One thing he said he sees regularly is employees inadvertently pasting sensitive company data into a personal ChatGPT or Claude account, instantly placing proprietary information outside the business’s control. The same risk extends to developers, who routinely download AI plug-ins directly from the internet without IT’s knowledge, often bringing security vulnerabilities in with them.

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