x.comthreadFranco Naumow. (@naumowf) on X
A tweet analyzing the Artificial Analysis Intelligence Index v4.3.2 finds that the best open-weights model, Xiaomi's MiMo-V2.6-Pro (released Sep 21, scoring 46), still trails what would have been the top closed frontier score as of 104 days earlier — Claude Fable 5's 50 on Jun 9, which itself surpassed the prior best (Claude Opus 4.8 at 42). It notes the current top-of-leaderboard gap is 12 points, with Claude Opus 5.5 (max) scoring 58, framing the persistent ~3.5-month lag of open weights behind the closed frontier.
TL;DR Open-weights leader MiMo-V2.6-Pro (46) still trails the closed frontier by ~104 days and 12 points (Claude Opus 5.5 at 58) on the Artificial Analysis Intelligence Index.
Organisations named here
Related in evals
