Haiku 5.5 extends capabilities to summarize long contexts, classify requests, and perform bulk text edits efficiently. It operates with adaptive thinking across five effort levels, defaulting to medium, and supports a 1 million token context window. Notably, it's designed to complement other models that handle complex planning and coding.
While vendor claims highlight faster responses and scalability, independent results on performance and reliability in large-scale environments remain to be broadly documented. Users can access Haiku 5.5 by updating the Kiro IDE or CLI and selecting it from the model menu in AWS GovCloud (US).
Source & further reading
Haiku 5.5 now available on Kiro in AWS GovCloud (US) ↗Source published 2026-11-02. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.