Opus 5.5 (High) hits #2 on Agent Arena, matching Opus 5 quality at 40-56% lower cost

arena · x · 2026-09-29

Agent Arena, a live agent-task leaderboard with 2M+ sessions, shows Claude Opus 5.5 (High) at #2, reshaping the Pareto frontier.

Related event: Claude Opus 5.5 Debuts Second on Agent Arena at 40-56% Lower Cost(2 posts)→

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