Claude Sonnet 5.5 Breaks Into Top 3 on Agent Arena, Narrowing Gap With Opus 5.5

Anthropic's Claude Sonnet 5.5 has secured the third position on Agent Arena, the real-world agentic task benchmark, with a confirmed 12.52% success rate and a median cost of $2.74 per task—marking a significant performance leap while maintaining price parity with its predecessor.