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Exciting news: Claude Sonnet 5.5 (Max) by @AnthropicAI has debuted at #3 in the Agent Arena with +12.5% net improvement! This release is a 8.1 percentage-point increase over Claude Sonnet 5 (High), which ranks #13 with +4.4% net improvement. By category, Claude Sonnet 5.5 secured the #1 spot in Chat (+15.6%) above both Fable 5.1 (+11.49%) and Opus 5.5 (+10.29%). This performance comes with a higher cost: Claude Sonnet 5.5 (Max) has a median cost of $2.74 per task, about 73% higher than #2 Claude Opus 5.5 (High) at $1.58. @AnthropicAI models now hold all three top positions in Agent Arena. Congrats to the team!