Former Anthropic researcher says an IPO roadshow slide helped push him out

Jacob Coxon links his resignation to a chart showing superexponential pretraining efficiency gains, just as Anthropic courts IPO investors Most people quit over a bad manager or a better offer. Jacob Coxon says a chart played a big part in his decision to leave Anthropic . On November 13, 2026, the former pretraining researcher said a slide from Anthropic’s IPO roadshow was a crucial factor in his resignation. The slide showed superexponential gains in pretraining compute efficiency , a selling point for investors and a warning sign for him. The timing matters. Anthropic is in the middle of a roadshow that aims to raise approximately $64 billion. Few companies want their pitch deck quoted back at them by a departed employee. First, some vocabulary.

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