USAMO : USA Math Olympiad. Referred here https://arxiv.org/pdf/2503.21934v1

IMO : International Math Olympiad

SOTA : State of the Art

OP is probably referring to this referred to this paper here https://arxiv.org/pdf/2503.21934v1. The paper explains out how a rigorous testing revealed abysmal performance of LLMs (results that are at odds with how they are hyped about).