GPT-5.4 and NVIDIA Nemotron 120B land in AWS GovCloud via Kiro

Full analysis

AWS has added two new models to Kiro — its AI-powered IDE and CLI — specifically for the AWS GovCloud (US-West) Region, which serves U.S. government and regulated workloads. OpenAI's GPT-5.4 arrives with a 272K context window and is positioned for multi-step agentic workflows (sequences of AI actions that use tools, interpret context, and verify outputs across multiple steps), running on Bedrock's next-generation inference engine with isolated queues for resilience. NVIDIA's Nemotron 3 Super 120B, an open-weight hybrid mixture-of-experts model (an architecture that routes inputs to a subset of specialized sub-networks, activating only 12B of 120B parameters here for compute efficiency), offers a 256K context window and is priced at a 0.25x credit multiplier — making it a cost-efficient option for agentic tasks in sovereign cloud environments.