Claude Sonnet 5 scores 53 on AI Index, nears Opus 4.8 at lower cost

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Claude Sonnet 5 achieves a score of 53 on the Artificial Analysis Intelligence Index v4.1, improving 6 points over Sonnet 4.6 with max effort. Without promotional pricing, it costs more per task than Opus 4.8 despite being a mid-tier model.

AnthropicClaude

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