Amazon Bedrock now supports OpenAI's open-weight GPT OSS models (120B and 20B) and NVIDIA Nemotron (Nano 9B v2, Nano 12B v2, Nano 30B, Super 120B) models in AWS GovCloud (US). This launch delivers two open-weight model families into the AWS GovCloud (US) Regions: OpenAI gpt-oss-120b and gpt-oss-20b, and the NVIDIA Nemotron 3 family, including Nemotron 3 Super 120B alongside the Nemotron 3 Nano models. Government agencies running workloads in AWS GovCloud (US) need AI capabilities that keep pace with the commercial sector while maintaining security and compliance controls. AWS GovCloud (US) provides an isolated set of AWS Regions designed to host sensitive data and regulated workloads, located in the United States and administered exclusively by U.S. citizens, helping customers meet compliance frameworks including FedRAMP High (Provisional Authority to Operate) and DoD Cloud Computing Security Requirements Guide (SRG) Impact Levels 2, 4, and 5. Amazon Bedrock is a fully managed service for accessing foundation models from independent model providers, with inference running entirely on AWS-operated infrastructure inside the AWS GovCloud (US) isolation boundary. With these models, users can build agentic applications and mission workflows such as automated security.