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Claude Haiku 5.5 Just Landed: Migrating a Haiku 4.5 Classifier Without the 400s (temperature, Prefill, Thinking Blocks)

This story is from 2026-10-08. It is preserved in the archive; the latest stories are on the live feed.

Attributed compile + one small offline smoke test Primary sources (Anthropic, 2026-10-07): Introducing Claude Haiku 5.5 (Anthropic); the Claude Platform docs What's new in Claude Haiku 5.5 , Migration guide , and Prompting Claude Haiku 5.5 Secondary: Introducing Claude Haiku 5.5 on AWS by Aamna Naj…

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  1. 2026-10-08 13:20 · DEV Community — AI
    Claude Haiku 5.5 Just Landed: Migrating a Haiku 4.5 Classifier Without the 400s (temperature, Prefill, Thinking Blocks)

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