# Amazon — ICYMI: What landed for AI builders in September 2026

- Company: Amazon (amazon.com)
- Announced: 2026-10-09T15:38:39+00:00
- Category: capability-change
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://aws.amazon.com/blogs/machine-learning/icymi-what-landed-for-ai-builders-in-september-2026/
- Record: https://forck.live/items/18762-icymi-what-landed-for-ai-builders-in-september-2026
- Subject: Bedrock / Nova
- Models affected: GPT-6 Astra, GPT-6 Astra Ultrafast, GPT-6.1 Sol, GPT-6 Sol, GPT 6.1 Luna, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, Kimi K3, Grok 4.6, Grok 4.7, Strands Decider 2B

Amazon announced several updates across Bedrock, AgentCore, and Strands. OpenAI's Astra, Sol, and Luna models became generally available on Bedrock, while Managed Agents powered by OpenAI entered public preview. Strands introduced an open source agent harness using 28% fewer tokens and a 2B-parameter decision model, Decider 2B. AgentCore's runtime improved memory management and cold start latency for serverless agents.

## Evidence

Verbatim from https://aws.amazon.com/blogs/machine-learning/icymi-what-landed-for-ai-builders-in-september-2026/:

> Strands harness is a new open source agent harness that matches popular harnesses on accuracy while using 28 percent fewer tokens.

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