Anthropic Claude Sonnet 5.5 and Claude Opus 5.5 are now available on Kiro in AWS GovCloud (US)

Two new Anthropic models are now available in the Kiro IDE and CLI for the AWS GovCloud (US) Regions. Claude Opus 5.5 is Anthropic's most capable Opus model yet and a step up from Opus 5 on long-running agentic coding work.