AWS Weekly Roundup: Claude Mythos Preview in Amazon Bedrock, AWS Agent Registry, and more (April 13, 2026) | Amazon Web Services

AWS’s April 13, 2026 roundup centers on improving governance and visibility as organizations move AI workloads into production. Amazon Bedrock added IAM user and role-based cost allocation, while Claude Mythos Preview and the AWS Agent Registry expanded capabilities for cybersecurity and agent management. The week also brought updates across storage, observability, WorkSpaces, and quantum computing.

Bedrock Cost Allocation

• Organizations can tag IAM users and roles with attributes such as team or cost center.
• Activated tags appear in Billing and Cost Management, AWS Cost Explorer, and detailed Cost and Usage Reports.
• This enables teams to track foundation model inference costs across departments, agents, and tools such as Claude Code on Bedrock.

Claude Mythos Preview in Amazon Bedrock

• Anthropic’s Claude Mythos is available as a gated research preview through Project Glasswing.
• The model is designed for advanced cybersecurity work, including:
  • Finding sophisticated vulnerabilities
  • Analyzing large codebases
  • Handling complex reasoning and coding tasks
• Access is limited to allowlisted organizations, with priority given to critical internet companies and open-source maintainers.

AWS Agent Registry

• AgentCore’s new registry provides a private catalog for AI agents, tools, skills, MCP servers, and custom resources.
• Features include semantic and keyword search, approval workflows, and CloudTrail auditing.
• Teams can access it through the AgentCore Console, AWS CLI, SDKs, or as an MCP server from IDEs.
• The goal is to improve reuse and governance instead of having teams independently recreate capabilities.

Other AWS Launches

• Amazon S3 Files: Exposes S3 buckets as shared file systems with file-system semantics, caching, and high aggregate read throughput. Applications can use file-system and S3 APIs simultaneously without migration or code changes.
• OpenSearch observability: Adds Managed Prometheus, PromQL support, RED metrics, agent tracing, and OpenTelemetry GenAI semantic conventions for correlating AI execution with logs and traces.
• WorkSpaces Advisor: Uses generative AI to diagnose Amazon WorkSpaces Personal configuration issues and recommend fixes.
• Amazon Braket: Adds Rigetti’s 108-qubit Cepheus-1-108Q processor, supporting Braket SDK, Qiskit, CUDA-Q, Pennylane, and pulse-level control.

Additional Resources and Upcoming Events

• AWS highlighted guidance for regional availability monitoring with S3, Bedrock model lifecycle management, memory-intensive Lambda managed instances, and OpenClaw deployment choices.
• Kiro is bringing back startup credits, offering eligible companies one year of Pro+ access across three team-size tiers.
• The virtual “What’s Next with AWS” event on April 28 will focus on agentic AI and feature AWS, OpenAI, and industry leaders.

Organizations adopting AI at scale should prioritize IAM-based cost attribution, centralized agent governance, and lifecycle planning for foundation models.