🚨 Anthropic Claude Sonnet 4.5 released! This is exciting. Looking forward to give it a spin. Amazing
written by Stefan Christoph
- One minute read🚨 Anthropic Claude Sonnet 4.5 released! This is exciting. Looking forward to give it a spin. Amazing to see the pace of innovation at Anthropic and very pleased to be able to use it from day 1 in Amazon Bedrock.
1️⃣ Per the launch announcements from AWS and Anthropic, Sonnet 4.5 improves on Claude 4 in tool handling and memory management, and has been observed maintaining focus for over 30 hours on complex, multi-step tasks. AWS positions it for agent use cases like patching security vulnerabilities, financial analysis, and turning research into actionable insights (https://aws.amazon.com/blogs/aws/introducing-claude-sonnet-4-5-in-amazon-bedrock-anthropics-most-intelligent-model-best-for-coding-and-complex-agents/).
2️⃣ Claude Sonnet 4.5 also works with Amazon Bedrock AgentCore for building complex agents — AgentCore adds the runtime around the model: session isolation, long-running agent support, and observability. Also, I expect Kiro support for Sonnet 4.5 to follow soon.
❓ Let me know your view on the latest release!
📝 Last updated: August 13, 2026 — Technical corrections from a quality audit