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A concise 1-page 5W1H engineering brief on Anthropic Claude Haiku 5.5: 90% lower per-token rates (≤100K), 1M context window, 72.4% on OSWorld 2.1, head-to-head benchmarks against Haiku 4.5, GPT-6 Luna, and Sonnet 5.5, plus breaking API migration rules.