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Claude Sonnet 5.5 ranks third on Agent Arena with 12.52% score

Verifying
  • Anthropic’s Claude Sonnet 5.5 reached third place on Arena.ai’s Agent Arena leaderboard.
  • 12.52% was Sonnet 5.5’s precise net improvement score, with a plus-or-minus 3.09% margin.
  • Sonnet 5.5 launched on September 28, 2026, and reached third place within days.
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