Anthropic Releases Haiku 4.5: Sonnet 4 Performance, Twice as Fast

MacStories
By Federico ViticciOct 15, 2025, 4:24 pm329 pts
Earlier today, Anthropic released Haiku 4.5, a new version of their “small and fast” model that matches Sonnet 4 performance from five months ago at a fraction of the cost and twice the speed. From their announcement: What was recently at the frontier is now cheaper and faster. Five months ago, Claude Sonnet 4…

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