Model updates

Official news, first rumor reports and substantive progress. Each entry keeps the information published at that time.

• Kiro adds Claude Haiku 5.5 across IDE, CLI, Web, and Crew at 0.06x credits

  Kiro says Claude Haiku 5.5 is live in Kiro IDE, CLI, Web, and Crew at 0.06x credits, positioning it for parallel subagents, quick reviews, and small edits across many files.

  OfficialOfficial updateOct 28Source: X @kirodotdevPart of Kiro
• Kiro adds experimental Kimi K3 support across IDE, CLI, Crew and Web for U.S. Pro-tier customers, with a 2.4x credit multiplier

  Amazon's Kiro changelog says Moonshot's open-weight Kimi K3 is available with experimental support in the Kiro IDE, CLI, Crew and Web for Pro, Pro+, Pro Max and Power customers in Kiro's US geography. The model accepts text and images with a 1M-token context and a 2.4x credit multiplier. Users need to restart the IDE or CLI, run kirocrew restart for Crew, or refresh Web to load the latest model list.

  OfficialOfficial updateOct 15Source: Amazon (Kiro)Part of Kiro
• Kiro retires Claude Sonnet 4 as of October 14 and points users to Claude Sonnet 5.5

  Amazon's Kiro changelog says Claude Sonnet 4 reached end of life in Kiro as of October 14, 2026. Users whose work depends on it need to choose another available model before continuing; Kiro names Claude Sonnet 5.5 as the latest Sonnet model and points to its model lifecycle page for stages and end-of-life dates.

  OfficialOfficial updateOct 14Source: KiroPart of Kiro

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