Anthropic launches Claude Sonnet 5.5, scoring 56 on the Artificial Analysis Intelligence Index, just 2 points below Opus 5.5

Anthropic 发布 Claude Sonnet 5.5，Artificial Analysis 智能指数得分 56，仅次于 Opus 5.5

Claude Sonnet 5.5 scored 56 on the Artificial Analysis Intelligence Index, only 2 points behind Opus 5.5 at max effort. It beats Sonnet 5 by 18 points under max effort. The post doesn't disclose release date, pricing, or API details.

Why it matters: Anthropic drops a new model with concrete benchmark numbers: Sonnet 5.5 scores 56, up 18 points from Sonnet 5, just 2 behind Opus 5.5. Hits all three HKR axes. Held below 90 because pricing and API details are missing — real-world value is still unknown.