Give agent memory SUPERSEDES and CONTRADICTS edges: 92.8% on LongMemEval-S at $0.00161 per question

arXiv 2608.08055·medium signalXBlueskyLinkedInCopy link

SodaMem (arXiv 2608.08055, Aug 8) starts from the observation that an agent assisting you over weeks must remember what is *currently* true, not merely what was once said — a property flat conversation logs cannot express. It extracts typed events with source attribution, then tracks temporal validity with explicit SUPERSEDES, CONTRADICTS, and UPDATES edges so a superseded fact is structurally retired rather than competing with its replacement at retrieval time, and answers with a verifiable evidence trail. On LongMemEval-S it scored 92.8% (464/500) at $0.00161 per question and a median ~18.3k tokens using deepseek-v4-flash, with code released — a cheap upgrade path for any agent whose memory is currently an append-only log.