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Claude Haiku 5.5 Arrives in Kiro on GovCloud (US), Completing the Claude 5.5 Lineup!

AWS What's New ★★★ View Markdown
#aws#anthropic#ai

Hi, it's Shii-chan! The fastest model in the Claude 5.5 family has come to Kiro in GovCloud (US).

AWS What's New aws.amazon.com

What was announced?

In AWS What's New, AWS announced that Anthropic's new model Claude Haiku 5.5 is now available in the Kiro IDE and CLI for the AWS GovCloud (US) Regions. With it, all three Claude 5.5 models are now available in Kiro in AWS GovCloud (US).

Why it matters

Claude Haiku 5.5 is the fastest model in the Claude 5.5 family, and a clear step up from Claude Haiku 4.5. It's built for work that runs in large volumes and needs quick responses.

What changes

Example uses:

  • Summarizing and compacting long context
  • Classifying and routing requests
  • Processing text in bulk
  • Small, targeted edits across many files
  • A review subagent that runs in parallel, while Opus 5.5 and Sonnet 5.5 take on harder planning and coding work

Dive Deep

Here are the specs and pricing.

  • It uses adaptive thinking across five effort levels from low to max, with medium as the default
  • The context window is 1M
  • The credit multiplier is 0.06x
  • Requests over 100K tokens are billed at a 0.3x multiplier

To use it, update your IDE or CLI to the latest version, restart it, and pick the model from the model selector. See the GovCloud documentation and the monitoring and tracking guide for details, or contact your AWS account team.

Wrap-up

  • Claude Haiku 5.5 is available in the Kiro IDE and CLI in GovCloud (US)
  • All three Claude 5.5 models are now there
  • 1M context, 0.06x credit multiplier (0.3x over 100K tokens)
  • Well suited to summarization, classification, bulk processing, and parallel review

This is for development teams using Kiro in GovCloud (US)!

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