A researcher questions whether Anthropic's claim of 4x productivity gains from Mythos AI would justify dramatically accelerating AI development timelines.

Anthropic's system card claims Mythos Preview delivers significant productivity uplift, stating 'We take this seriously and it is consistent with our own internal experience of the model.'

The author interprets a 4x productivity claim as equivalent to making all technical employees work 4 hours at normal productivity for every 1 hour worked, with zero AI assistance needed.

This '4x serial labor acceleration' across all activities (meetings, coding, thinking, writing) would represent transformative capability if accurate.

The author expresses skepticism, suggesting it's 'very unlikely' that Anthropic's current AIs truly deliver such dramatic productivity gains despite their public claims.