Haiku 5.5 replaces Haiku 4.5 in consumer Claude plans

AI illustration: a compact glowing neural network inside a transparent cube on a desk.
Image: Vidgetc · AI-generated illustration / ШІ-ілюстрація / ИИ-иллюстрация License: Неофіційна концептуальна ілюстрація / Неофициальная концептуальная иллюстрация / Unofficial conceptual illustration

Haiku 5.5 replaced Haiku 4.5 in the model selector for Claude chat, Cowork and Design on Free, Pro and Max plans on October 29. Existing chats remain saved. Haiku 4.5 is still available in Claude Code, the API, and Team and Enterprise plans.

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