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Claude Opus 5.5 and Sonnet 5.5 Reach Amazon Bedrock in AWS GovCloud
AWS says Claude Opus 5.5 and Claude Sonnet 5.5 are now available on Amazon Bedrock in AWS GovCloud (US), and outlines their use with Claude Code for regulated development workloads. The post also details the two Bedrock endpoint options and their different GovCloud regional availability.
Full Report
AWS said on October 5, 2026, that Claude Opus 5.5 and Claude Sonnet 5.5 are available on Amazon Bedrock in AWS GovCloud (US). AWS presents the deployment as an on-ramp for AI-assisted development on workloads subject to regulatory or compliance requirements, including ITAR. Its post explores pairing the models with Anthropic's agentic coding tool, Claude Code, to speed up everyday development tasks while maintaining compliance alignment.
The deployment path depends on the endpoint. AWS says bedrock-runtime uses the AWS SDK and supports InvokeModel and Converse, along with Guardrails, Knowledge Bases, Agents, and invocation logging. AWS recommends it for most new applications, especially those that require audit trails. bedrock-mantle natively supports the Anthropic Messages API and offers server-side tools, background inference, and Projects. AWS describes both endpoints as using the same Mantle inference engine and Zero Operator Access architecture.
Regional access differs: bedrock-runtime is available in AWS GovCloud (US-West) and AWS GovCloud (US-East), while bedrock-mantle is available in AWS GovCloud (US-West). AWS says both endpoints support Claude Opus 5.5, Claude Sonnet 5.5, and Claude Sonnet 5.
The update is about the GovCloud deployment and endpoint choices, rather than Claude Sonnet 5.5's first arrival on AWS: Anthropic's September 28, 2026 announcement had already listed AWS, Google Cloud, and Microsoft Azure as platforms where Sonnet 5.5 was available. For teams with regulated workloads, AWS's post adds detail on deployment regions, API options, and integrations to consider when assessing a path into GovCloud.
Why This Matters
The announcement extends the Amazon Bedrock use case for both models into AWS GovCloud (US) and specifies endpoint and regional differences. For regulated or ITAR workloads, those details help teams assess API compatibility, audit needs, and deployment location. The post should not be read as independent confirmation of each model's current certification status.
Evidence
Start with the primary evidence, then review supporting sources and context.
Primary Evidence
1Supercharge regulated workloads with Claude Code and Amazon Bedrock
Bradley Wyman
“Anthropic Claude Opus 5.5 and Claude Sonnet 5.5 are available on Amazon Bedrock in the AWS GovCloud (US) Regions. Learn how to use them with Claude Code, Anthropic's agentic coding tool, for compliance-aligned, AI-assisted development on regulated and ITAR workloads.”
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