Claude Sonnet 5.5 now available on Amazon Bedrock and Claude Platform on AWS

Claude Sonnet 5.5 Release

Claude Sonnet 5.5 has been released and is now accessible on Amazon Bedrock and Claude Platform on AWS. This new version is presented as a more efficient Sonnet model, specifically designed for focused coding and knowledge-based tasks.

Key Improvements and Cost Efficiency

Sonnet 5.5 demonstrates improvements in handling well-scoped work, such as completing feature development or bug fixes and verifying results against requirements. It also produces more refined documents and visuals, including one-pagers, architecture diagrams, and summary slides. The model features a lower cost per task for most work and operates at a faster speed, making it suitable for continuous or large-scale operations.

Potential applications include first response to alerts, always-on monitoring, SQL generation, UI/UX testing, and fast coding agents in IDEs for engineering. For enterprise use, it supports scoped analysis, short spreadsheet edits, and routine document tasks for large user populations.

Integration with AWS Infrastructure

Availability on Amazon Bedrock means Sonnet 5.5 operates within AWS infrastructure, maintaining regional data residency. It integrates with existing AWS controls such as AWS Identity and Access Management (IAM) for access, AWS CloudTrail for auditing, Amazon CloudWatch for monitoring, and Amazon Bedrock Guardrails. Usage charges appear on the standard AWS bill.

Complementing Claude Opus 5.5

Sonnet 5.5 can be paired with Claude Opus 5.5 for different types of tasks. Opus 5.5 is intended for judgment-intensive decisions like release debugging, multi-PR feature stacks, security reviews, and long analyses. Sonnet 5.5 is designed for executing tasks where the approach is already clear, focusing on speed and cost efficiency for well-defined work.