Emergency stop
Halt an out-of-control system in seconds.
Key facts
- Proposals converge on three elements — emergency stop, remote override, and pre-set hard limits — rather than a single physical button. Source
- California's executive order of 18 September 2026 adds a fourth element: shutdown capability attested by independent verification organizations. Source
- The AI Kill Switch Act, introduced on 23 July 2026, treats shutdown as a government authority rather than a product feature. Source
Definition
Three pillars of control
Remote override
Keep meaningful human control across distributed systems.
Hard limits
Pre-set conditions can automatically trigger shutdown.
Software layer
Revoke credentials, halt processes, disable model endpoints, and isolate networks.
Physical layer
Cut power or compute access at infrastructure level when software control is insufficient.
Implementation is starting to converge on a third element: verification. California's September 2026 executive order advances a frontier-model kill switch attested by independent verification organizations rather than by developers themselves, and folds loss-of-control events into its incident definitions.
Last updated: September 21, 2026
Edited by Juan L Aguirre