Claude Opus 5.5 Climbs to No. 2 on Agent Arena at Lower Task Cost
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Claude Opus 5.5 (High) has entered the Agent Arena overall ranking at No. 2, giving Anthropic a new high-scoring but cheaper option for long-running agent tasks. The live table dated September 27, 2026 lists the model at +12.15% net improvement and a $1.35 median cost per task.
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