Xiaomi MiMo-V2.6-Pro tops open-weight benchmarks with simple attention design

Xiaomi's MiMo-V2.6-Pro ranks first among open-weight models on the Artificial Analysis Intelligence Index with a score of 46. The author attributes its standing mainly to a training data and post-training recipe that increased agent tasks and used an agentic grader for rewards, rather than its plain Grouped Query Attention and Sliding Window Attention design with a 128-token window.