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      <title>Sonnet 5 来了：性能“蹭”上Opus，钱包却“抖”了三抖？</title>
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      <description>Anthropic 发布 Claude Sonnet 5，性能接近 Opus 4.8，但换了 tokenizer 导致实际使用成本不降反升。虽然 Agent 能力增强且更安全，但高昂的运行成本让它成了“最贵的 Sonnet”，性价比争议巨大。</description>
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