AWS Launches Claude Sonnet 5.5 on Amazon Bedrock and Claude Platform

AWS announced Claude Sonnet 5.5 on September 28, 2026, making it available on Amazon Bedrock and Claude Platform on AWS. AWS describes it as a step up from Sonnet 5, aimed at focused coding and knowledge work. The company says the model can complete most work at a lower cost per task and faster speed; its announcement does not give a specific price figure.

AWS points to well-scoped coding tasks such as building or fixing features and checking the result against requirements. For knowledge work, it cites one-pagers, architecture diagrams, summary slides, document edits, and spreadsheet cleanup. The examples position Sonnet 5.5 for tasks where the desired outcome and approach are already relatively clear.

Availability differs by AWS service: Sonnet 5.5 is offered on Bedrock through the Global CRIS inference profile, while Claude Platform on AWS availability is in North America. AWS says Bedrock keeps data within AWS infrastructure with regional data residency and supports controls including IAM, CloudTrail, CloudWatch, and Bedrock Guardrails; usage appears on the AWS bill.

Users can try the model in the Amazon Bedrock console Playground or call it programmatically through the Anthropic Messages API, or Bedrock Runtime’s Invoke and Converse APIs. The release follows AWS’s June 30, 2026 announcement of Claude Sonnet 5 on both services, with AWS presenting Sonnet 5.5 as a newer option for more clearly scoped work.