Claude Opus 5.5 and Sonnet 5.5 reach Kiro in AWS GovCloud (US)

The new step is government availability. Claude 5.5 coding agents can now run in GovCloud environments that handle regulated workloads.

Opus 5.5's adaptive thinking decides per request how much effort a task needs. That is where the efficiency claims come from: roughly 40% fewer tool calls and about half the tokens of Opus 5.

Kiro usage reportedly tripled quarter over quarter, which makes it one of AWS's fastest-growing AI products. The release also extends Anthropic's lead in the public-sector coding market at a time when OpenAI models are arriving on Bedrock.

Next to watch: the timing of FedRAMP High coverage, and how Haiku 5.5's pricing cliff above 100K tokens affects agent workloads.