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Moving from Claude Haiku 4.5 to 5.5: what changed on the same 100 prompts

This story is from 2026-10-18. It is preserved in the archive; the latest stories are on the live feed.

Claude Haiku 4.5 leaves the model picker in the Claude apps on October 29, and Haiku 5.5 takes its place. On the API, 4.5 is still active, but its listed retirement date, "not sooner than October 15, 2026", has already passed, so a notice could come at any time. Anthropic's migration guide lists th…

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  1. 2026-10-18 12:21 · DEV Community — AI
    Moving from Claude Haiku 4.5 to 5.5: what changed on the same 100 prompts

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