Claude Opus 5.5 is now available on AWS

Anthropic's Claude Opus 5.5, the first model in the Claude 5.5 family, is now available on Amazon Bedrock and Claude Platform on AWS, AWS announced. Anthropic says Claude Opus 5.5 does more with fewer tokens than Claude Opus 5, with lower per-token prices and cheaper cache reads producing an average lower cost per task, and it is the first Opus model to ship with safety classifiers similar to Claude Fable 5.1 in biology, cyber security, and AI development. The model targets agentic coding, knowledge work, and long-running tasks, with adaptive thinking always on and effort as the control instead of manual thinking budgets.

Artificial Intelligence https://aws.amazon.com/blogs/machine-learning/ Claude Opus 5.5 is now available on AWS Today, we’re excited to announce the availability of Claude Opus 5.5 on Amazon Bedrock https://aws.amazon.com/bedrock/ and Claude Platform on AWS https://aws.amazon.com/blogs/machine-learning/introducing-claude-platform-on-aws-anthropics-native-platform-through-your-aws-account/ , the first of the Claude 5.5 model family. Claude Opus 5.5 is Anthropic’s most capable Opus model suitable for agentic coding, knowledge work, and long-running tasks. This post covers Claude Opus 5.5’s improvements, practical guidance, and how to start building with the model on Amazon Bedrock. What makes Claude Opus 5.5 different According to Anthropic, Claude Opus 5.5 does more with fewer tokens than Claude Opus 5, and new pricing passes those gains straight to customers. Lower per-token prices and much cheaper cache reads stack on top of the efficiency gains. The result is an average lower cost per task than Claude Opus 5, so teams can run more ambitious agentic work at scale. Claude Opus 5.5 is trained to communicate more clearly. As it works, it surfaces what it did, what it found, and what it needs, making long-running tasks easier to follow. Adaptive thinking is always on, and Opus 5.5 decides how much reasoning each task needs. You can use effort as your control instead of manual thinking budgets. Claude Opus 5.5 is the first Opus model that comes with safety classifiers similar to Claude Fable 5.1 in biology, cyber security, and AI development. Requests will be refused more frequently as compared to previous Opus versions. Use cases Claude Opus 5.5 capabilities are a good fit for industries where consistency and depth matter most. In software development, Opus 5.5 is an improvement over Opus 5 for longer-running sessions with clear communication and explainability, making it easier to use, review, and trust. For knowledge work, it requires fewer corrections compared to Opus 5 while working with and creating long documents and reports. Getting started with Claude Opus 5.5 on Amazon Bedrock To try Claude Opus 5.5, open the Amazon Bedrock console https://console.aws.amazon.com/bedrock/ , choose Test , then Playground , and select Claude Opus 5.5 as the model. From there, you can run a prompt directly against it. Programmatically, you can call the model with the Anthropic Messages API https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters-anthropic-claude-messages.html against bedrock-runtime and bedrock-mantle through the Anthropic SDK . You can also stay on the Invoke https://docs.aws.amazon.com/bedrock/latest/userguide/inference-api.html and Converse https://docs.aws.amazon.com/bedrock/latest/userguide/conversation-inference.html APIs on bedrock-runtime through the AWS Command Line Interface AWS CLI https://aws.amazon.com/cli/ and AWS SDK https://aws.amazon.com/developer/tools/ . Prerequisites 1. Active AWS account with Amazon Bedrock access. 2. AWS Command Line Interface AWS CLI installed and configured. 3. Python 3.10+. 4. Boto3 installed: pip install boto3 . 5. Anthropic SDK installed: pip install anthropic . 6. The Amazon Bedrock Token Generator for Amazon Bedrock authentication installed: pip install aws bedrock token generator . 7. AWS Identity and Access Management IAM permissions: bedrock:InvokeModel and bedrock:InvokeModelWithResponseStream . Here’s a quick example using the AWS SDK for Python Boto3 : You can also use the Amazon Bedrock Converse API for a unified multi-model experience: You can also use the Anthropic Messages API through the anthropic SDK package for a streamlined experience: You can explore the Getting Started notebook https://github.com/aws-samples/anthropic-on-aws/blob/main/notebooks/claude fable 5 1 getting started/claude-fable-5-1-getting-started.ipynb for more examples. You can monitor usage, performance, and costs through Amazon CloudWatch https://docs.aws.amazon.com/bedrock/latest/userguide/monitoring.html and AWS Cost Explorer https://aws.amazon.com/aws-cost-management/aws-cost-explorer/ to scale your applications as demand grows. Availability Claude Opus 5.5 is available today on Amazon Bedrock through the US Geo CRIS us. , EU Geo CRIS eu. , AU Geo CRIS au. , JP Geo CRIS jp. and Global CRIS global. inference profiles on bedrock-runtime . The model also runs in the US East N. Virginia Region us-east-1 , AP SouthEast Melbourne Region ap-southeast-4 on bedrock-mantle. See the Amazon Bedrock documentation https://docs.aws.amazon.com/bedrock/latest/userguide/model-cards-anthropic.html for the full list of supported Regions. For pricing information, see Amazon Bedrock pricing https://aws.amazon.com/bedrock/pricing/ . It is also available through Claude Platform on AWS in North America. Give Claude Opus 5.5 a try in the Amazon Bedrock console https://console.aws.amazon.com/bedrock , in Claude Platform on AWS https://console.aws.amazon.com/claude-platform/ , or explore the Getting Started notebooks https://github.com/aws-samples/anthropic-on-aws/tree/main/notebooks on GitHub.