Post Syndicated from Marta Taggart original https://aws.amazon.com/blogs/security/run-open-weight-models-on-aws-bedrock-in-aws-european-sovereign-cloud/

European organizations can run AI workloads on Amazon Web Services (AWS) while keeping data within the European Union (EU) and meeting regulatory requirements. You can now run generative AI workloads on open weight models on Amazon Bedrock in the AWS European Sovereign Cloud. We’re excited to announce the general availability of the first open weight model family, Gemma 4, on the Amazon Bedrock next-generation inference engine in the AWS European Sovereign Cloud. Gemma 4, released under the Apache 2.0 license, on Amazon Bedrock benefits from the same data residency and operational controls that define the AWS European Sovereign Cloud so you can build, iterate, and scale generative AI applications while meeting digital sovereignty requirements.

The AWS European Sovereign Cloud is an independent cloud for Europe, located entirely within the EU, designed to help customers meet their most stringent digital sovereignty requirements. It runs entirely within the EU and is independently operated with strong technical controls, sovereign assurances and legal protections. Only AWS employees who reside in the EU control day-to-day operations, including access to data centers, technical support, and customer service.

In this post, we explain how the Amazon Bedrock inference engine protects your inference data when running Gemma 4 models, how the AWS European Sovereign Cloud keeps it within the EU, and then walk through the available Gemma 4 models and your first inference request.

The inference engine is a distributed engine for serving large-scale machine learning models, built for high performance, reliability, and security. You reach it through the bedrock-mantle endpoint, which supports OpenAI-compatible APIs (the Responses and Chat Completions APIs). You can bring an existing OpenAI SDK codebase to Amazon Bedrock by changing only the base URL and API key. The Responses API supports stateful conversation management, which rebuilds context without you passing conversation history with each request. Stored responses are scoped by Amazon Bedrock project, a logical boundary that represents a workload for access control, cost tracking, and usage monitoring.

The engine applies the same operational security practices you rely on across AWS. Access follows a least privilege model, where each operator has access only to the systems a specific task requires, and only for the time that privilege is needed. Any access to systems that store or process customer data or metadata is logged, monitored for anomalies, and audited. All your prompts and responses are kept private during inference.

Amazon Bedrock uses a zero operator access data security model, meaning no service operators can access model input or output during inference. It also uses a zero data retention model, so by default it doesn’t store your inputs or outputs. For certain models, limited retention might apply for abuse detection (see the Amazon Bedrock abuse detection documentation). Your prompts and responses are encrypted in transit and, by default, are not shared with the model provider.

All inference stays within the eusc-de-east-1 AWS Region as described in the following section on data residency. Combined with the data residency and EU-based operations of the AWS European Sovereign Cloud, this gives organizations in highly regulated industries the confidence to run their most sensitive AI workloads in the cloud.

The AWS European Sovereign Cloud became generally available in January 2026, with its first Region in Brandenburg, Germany (eusc-de-east-1). It’s a separate, independently operated cloud, with infrastructure located entirely within the EU and no critical dependencies on non-EU personnel or infrastructure. All your content remains within the Region you select unless you choose otherwise. Beyond content, customer-created metadata including roles, permissions, resource labels, and configurations also stays within the EU. The AWS European Sovereign Cloud is operated exclusively by EU residents located in the EU. We’re also gradually transitioning the AWS European Sovereign Cloud to be operated exclusively by EU citizens located in the EU. During this transition period we will continue to work with a blended team of EU residents and EU citizens located in the EU.

All Amazon Bedrock inference requests, including Gemma 4, use in-Region inference in eusc-de-east-1, which keeps every request within the AWS European Sovereign Cloud. Global cross-Region inference, which routes requests across commercial AWS Regions worldwide, isn’t available in the AWS European Sovereign Cloud.

With AWS Identity and Access Management (IAM), you decide which principals in your account can call the inference API and which models they can use. Fine-grained permissions let you grant only the access each workload needs, following least privilege, and we recommend short-lived credentials over long-term keys.

For auditing, every call to the endpoint is recorded in AWS CloudTrail, giving your security and compliance teams an audit trail of who invoked inference and when. You can also monitor usage with Amazon CloudWatch and set alarms on patterns that matter to you, such as unexpected spikes in request volume.

Organizations adopting open weight foundation models (FMs) for production face a constant challenge: how to access the leading models without compromising on data protection, regulatory alignment, or operational control. Amazon Bedrock removes that challenge. It gives you leading open weight FMs through a fully managed service, with inference running entirely on infrastructure operated by AWS and the security and privacy controls you expect from Amazon Bedrock. Because the models are open weight, you can independently evaluate the model architecture and training methodology, benchmark your own workloads, and fine-tune on proprietary data when customization is required.

Gemma 4 is a family of open weight models, released under the Apache 2.0 license. It’s available in three instruction-tuned variants, so you can evaluate and choose the model that fits your workload. The following table provides guidance on which model to choose based on your use case:

All three variants offer built-in reasoning, native function calling, and multimodal input across text and image.

Gemma 4 is served through the bedrock-mantle endpoint, the OpenAI-compatible API for the next-generation inference engine, so you can call it with the OpenAI Python and TypeScript SDKs. Use the following steps to use the OpenAI Python SDK to send your first request to Gemma 4 31B in the AWS European Sovereign Cloud.

To follow this example, you need an AWS account with access to the AWS European Sovereign Cloud and an IAM principal with permissions to call the bedrock-mantle endpoint. Create an IAM policy that grants the two actions this walkthrough uses, then attach it to your IAM principal. The bedrock-mantle:CreateInference action runs inference, and the bedrock-mantle:CallWithBearerToken action authenticates with an Amazon Bedrock API key. The following sample policy grants the actions this example needs. Scope the resources further for your environment as described after the policy.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "GemmaMantleInference",
      "Effect": "Allow",
      "Action": "bedrock-mantle:CreateInference",
      "Resource": "arn:aws-eusc:bedrock-mantle:eusc-de-east-1:<account-id>:project/<project-id>"
    },
    {
      "Sid": "GemmaMantleBearerToken",
      "Effect": "Allow",
      "Action": "bedrock-mantle:CallWithBearerToken",
      "Resource": "*"
    }
  ]
}

Replace <account-id> and <project-id> with your own values.

Install the OpenAI SDK and the Amazon Bedrock token generator with the command pip install “openai>=2.45.0" aws-bedrock-token-generator.

You authenticate with an Amazon Bedrock API key. Amazon Bedrock offers two types of API keys. Short-term keys expire automatically within 12 hours and inherit the permissions of the IAM principal that generated them, which makes them the recommended choice for production. Long-term keys last until a configured expiration and are intended for development and exploration. For production, use the auto-refreshing short-term key shown in the following example, or store the key in AWS Secrets Manager.

from aws_bedrock_token_generator import provide_token
from openai import BedrockOpenAI

region = "eusc-de-east-1"

client = BedrockOpenAI(
    aws_region=region,
    base_url="https://bedrock-mantle.eusc-de-east-1.api.amazonwebservices.eu/v1",
    bedrock_token_provider=lambda: provide_token(region=region),
)

Alternatively, you can pass a short-term API key through an environment variable. This key isn’t refreshed and expires after at most 12 hours.

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://bedrock-mantle.eusc-de-east-1.api.amazonwebservices.eu/v1",
    api_key=os.environ["AWS_BEARER_TOKEN_BEDROCK"],
)

The Responses API uses a single input field and returns the generated text in output_text. Setting store to false means Amazon Bedrock doesn’t retain the request or response.

response = client.responses.create(
    model="google.gemma-4-31b-it",
    input="Explain the benefits of open-weight models for regulated industries.",
    max_output_tokens=512,
    store=False,
)
print(response.output_text)

You can also call the OpenAI-compatible Chat Completions endpoint directly. If you use AWS credentials instead of an API key, sign the request with AWS Signature Version 4 (SigV4), as in the following example.

export ENDPOINT=https://bedrock-mantle.eusc-de-east-1.api.amazonwebservices.eu
export AWS_REGION=eusc-de-east-1

curl -X POST ${ENDPOINT}/v1/chat/completions \
  --aws-sigv4 "aws:amz:${AWS_REGION}:bedrock" \
  --user "${AWS_ACCESS_KEY_ID}:${AWS_SECRET_ACCESS_KEY}" \
  -H "x-amz-security-token: ${AWS_SESSION_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google.gemma-4-31b-it",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

This walkthrough creates no persistent resources, so there’s nothing to delete. The short-term API keys used here expire automatically within 12 hours.

Gemma 4 is available in Amazon Bedrock in the AWS European Sovereign Cloud. You pay per token with no upfront commitment, and usage counts toward your existing AWS commitments. For current pricing, see Amazon Bedrock pricing. For model and Regional availability, see Regional availability by models.

Beyond the technical integration, running AI workloads in a sovereign context raises important questions about requirements. As you plan AI workloads for a sovereign context, evaluate them against your organization’s requirements for data residency, model governance, and operational control. The AWS European Sovereign Cloud is designed to help you meet these requirements in the EU.

AWS is committed to making AWS the best place for European organizations to innovate with AI, without compromise. To learn more about AWS European Sovereign Cloud visit aws.eu.

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