Anthropic Claude Sonnet 4.5 Arrives on Amazon Bedrock

Amazon Web Services (AWS) announced the availability of Claude Sonnet 4.5 in Amazon Bedrock, joining the existing Claude 4 models available to customers.

These hybrid reasoning models (meaning they can toggle between near-instant responses and extended thinking) have set new standards across coding, advanced reasoning, and multi-step workflows, according to Anthropic. They enable sustained performance on complex, long-running tasks and can power AI agents capable of doing hours of work in minutes.

The expansion of Claude models available in Amazon Bedrock enhances customers’ AI choices with increasingly advanced models, simplifying how customers build better, more transformative applications with enterprise-grade security and responsible AI controls.

The latest Claude models fundamentally change how teams approach complex projects. This is especially true for large enterprises tackling work that requires sustained effort and deep expertise, AWS said.

Claude Sonnet 4.5 is Anthropic’s “most intelligent model and its best performing for both coding and agents, particularly for long-running, complex tasks that require peak accuracy.”

This includes long-horizon coding tasks that span both sophisticated software projects and everyday development tasks. It demonstrates enhanced knowledge across finance, research, and cybersecurity, supporting use cases such as financial forecasting, vulnerability detection and patching, and content generation.

Claude Opus 4.1 delivers improved performance and precision over Opus 4 for coding and agentic tasks.

The model also offers improved frontend code generation, delivering strong visual output quality with a focus on effectively handling complex logic.

Claude Sonnet 4 offers a balance of performance and cost optimization for high-volume use cases. The model can power everything from real-time customer support agents to everyday development tasks like code reviews and bug fixes, and can also serve as a task-specific sub agent to handle multiple tasks at once, such as search, data analysis, or content synthesis. Customers in travel and hospitality can use Claude Sonnet 4 to run customer requests and deliver personalized responses in near real-time.

"Claude Sonnet 4.5 transforms AI from a tool into a true collaborator for every person and every team. Our customers will see project timelines shrink—in many cases from weeks to hours," said Kate Jensen, head of growth and revenue, Anthropic. "Claude models consistently set new standards in coding, advanced reasoning, and multi-step workflows while understanding full business contexts and delivering precise results. The real breakthrough is freeing your talent for strategic work while Claude handles the heavy lifting."

According to Anthropic, the latest generation of Claude models points toward a future where AI systems become increasingly capable partners in both creative and knowledge work.

For more information about this news, visit https://aws.amazon.com.