Anthropic's S-1/A diffed against its S-1 on the AI R&D acceleration threshold

Anthropic's November 2, 2026 amended S-1 says its internal estimates and expectations about future models indicate it "may imminently meet" its Responsible Scaling Policy's threshold for dramatically accelerated AI progress, while stating no current model has been designated as exceeding it. The threshold is met by models that could fully substitute for Anthropic's research scientists and engineers at within 5x cost, or by observing or expecting roughly double the usual rate of AI progress plausibly due to automated R&D; Anthropic's August 2026 Risk Report put the pace below 2x and called the conclusion uncertain and lagging. The amendment also adds that Anthropic does not anticipate safely using Claude to fully autonomously design and build successive frontier models without meaningful human supervision, and that it is considering RSP updates to keep humans in control.