Anthropic's revised S-1A registration statement, filed Monday with the SEC, contains a striking disclosure: the company believes it may soon meet its own internal definition of recursive self-improvement (RSI) — the point at which AI systems can autonomously improve their own training, triggering a capability acceleration loop. The filing says its internal estimates and expectations regarding future models, rather than its current models, indicate it may imminently meet its Responsible Scaling Policy's definition of "dramatically accelerated progress attributable to AI" [6]. Anthropic adds that none of its current models have crossed that threshold and that it is considering updates to its Responsible Scaling Policy "to keep humans in control of frontier model development at Anthropic" [6].