Claude Haiku 5.5 returns with performance and safety improvements

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Alex Getman @alexgetmancom · 22 Sep 2026, 17:39 UTC · Updated 31 Oct 2026, 20:59 UTC

Little Haiku is finally coming back. I think it’ll give GPT-6 Luna some solid competition.

Screenshot of text: Claude Sonnet 5.5 and Claude Haiku 5.5 will follow in the coming weeks, with many of the same improvements to performance, efficiency, and safety.

Anthropic Claude

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