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Zenn (AI)Japan

Claude Haiku 5.5 へ Haiku 4.5 から移行するときに壊れる 6 つと、単価が 5 倍になる条件

October 12

2026 年 10 月 7 日に Claude Haiku 5.5(claude-haiku-5-5)が出ました。Haiku 系で初めて adaptive thinking と effort を持ち、1M コンテキスト・128K 出力で、API の形は Opus 5.5 / Sonnet 5.5 に揃っています。

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