Center for AI Safety (CAIS) — campaign: Statement on AI Risk (May 2023): one-sentence statement 'Mitigating the risk of extinction from AI should be a global priority alongside other societal-scale risks such as pandemics and nuclear war.' Signed by 350+ AI leaders including Geoffery Hinton, Demis Hassabis, Sam Altman, and Dario Amodei.

NoteThe claim is largely confirmed: (1) the one-sentence statement text matches exactly, (2) the four named signatories (Geoffrey Hinton, Demis Hassabis, Sam Altman, Dario Amodei) are all present in the source, and (3) the source is from CAIS's official Statement on AI Risk page. However, the claim specifies '350+ AI leaders' as of May 2023, but the source text does not explicitly state the total number of signatories. The source shows a partial list with a 'Show more' button, indicating more signatories exist, but the exact count of 350+ cannot be verified from this excerpt. This is a partial confirmation because the core claim elements are verified, but the specific signatory count cannot be confirmed from the provided source text.