Center for AI Safety — 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.

Note: The source text confirms: (1) the exact one-sentence statement about mitigating extinction risk from AI, (2) that it is CAIS's Statement on AI Risk, and (3) that the named individuals (Hinton, Hassabis, Altman, Amodei) are signatories. However, the source excerpt provided does not include the total signatory count. The source shows a partial list of signatories but does not state '350+' or confirm the May 2023 date. The claim about the number of signatories and the specific date cannot be verified from this excerpt alone, making this a partial confirmation rather than full confirmation.