BAAI unveils AREX, a 122B MoE research agent for hard search

BAAI introduced AREX, a research agent built on a 122B-parameter mixture-of-experts model with 10B active parameters. It drafts candidate answers, checks each constraint, and revisits unresolved points rather than running one long search. The post says AREX performs on hard search benchmarks comparable to GPT-5.4.