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model: haiku stopped meaning one thing. Pin the exact model id.

This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.

Claude Code 2.1.293 shipped on October 7 with one line that looks like routine model plumbing: "Added Claude Haiku 5.5 ( claude-haiku-5-5 ), now the default Haiku model on the Anthropic API." Read it twice, because one phrase is doing all the work: on the Anthropic API . The changelog does not say…

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  1. 2026-10-20 12:36 · DEV Community — AI
    model: haiku stopped meaning one thing. Pin the exact model id.

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