ICYMI: What landed for AI builders in September 2026
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AWS released a comprehensive recap of updates for AI builders in September 2026, focusing on Amazon Bedrock, AgentCore, and Strands. A key development is the public preview of Amazon Bedrock Managed Agents powered by OpenAI, which allows developers to build secure agents while keeping data within AWS infrastructure. The latest AgentCore runtime improvements offer lower cold start latency and pay-as-you-go pricing, enabling faster and more cost-efficient serverless agent operations. Strands introduced a new open-source harness that reduces token usage by 28 percent and features Decider 2B, a small decision model optimized for agentic tasks like tool selection. Model availability expanded significantly with the general release of OpenAI’s Astra, Sol, and Luna models, offering varied performance tiers for different workloads. Additionally, new versions of Claude, including Fable 5.1 and Opus 5.5, were added to support complex coding and scientific research with adaptive reasoning capabilities. Frontier models from Moonshot AI and xAI, such as Kimi K3 and Grok 4.7, are now available to handle large context windows and long-running tasks. Finally, Amazon Bedrock Managed Knowledge Base enhanced enterprise control through automatic sync scheduling and native connectors for platforms like ServiceNow and Salesforce.
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