Arena says beating April’s WebDev leader cost under a twentieth as much by October

Arena’s analysis of 105 WebDev models finds a bargain—with an expensive catch. By October, Xiaomi’s MiMo-V2.6-Flash outscored April leader Claude Opus 4.7 at less than a twentieth of the cost per answer. But chasing the crown got pricier: Arena puts October leader Claude Opus 5.5 (Max) at about $10 per answer, versus $1.06 for April’s best.