OpenAI GPT-5.4 and NVIDIA Nemotron 3 Super 120B now available on Kiro in AWS GovCloud (US-West) Region

Two new models are now available in the Kiro IDE and CLI for the AWS GovCloud (US-West) Region.

OpenAI GPT-5.4 is now available in Kiro for complex reasoning, coding, document analysis, and multi-step agentic workflows. It helps developers build AI applications and production workflows that can interpret context, interact with tools, operate software environments, and verify outputs across multiple steps. GPT-5.4 runs on Amazon Bedrock's next-generation inference engine with isolated queues and durable execution for resilient workloads. Available with a 272K context window and 1.2x credit multiplier.

NVIDIA Nemotron 3 Super 120B is now available in Kiro as an open weight model option. A hybrid mixture-of-experts model activating only 12B of its 120B parameters for high compute efficiency and fast inference on agentic tasks. 256K context window with 32K max output. Available with a 0.25x credit multiplier.

Ensure your IDE or CLI is updated to the latest version, then restart it to access the new models from the model selector. For more details about Kiro in AWS GovCloud (US), visit the GovCloud documentation or contact your AWS account team for more information. To learn more about Kiro, visit the Kiro product page.