# Amazon — The new AgentCore runtime: Elastic, optimized, and consistently fast starts

- Company: Amazon (amazon.com)
- Announced: 2026-09-18T15:31:34+00:00
- Category: infrastructure-release
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://aws.amazon.com/blogs/machine-learning/the-new-agentcore-runtime-elastic-optimized-and-consistently-fast-starts/
- Record: https://forck.live/items/12210-the-new-agentcore-runtime-elastic-optimized-and-consistently-fast-starts
- Subject: Bedrock / Nova
- Pricing: You pay only for what you consume, and not for idle CPU waiting for I/O. Billing follows resource usage, so there's no standing charge for capacity you provisioned "just in case." Memory is released back the instant a session ends.

Amazon announced an enhanced AgentCore runtime for Amazon Bedrock AgentCore, a managed compute layer for deploying and running agents at scale. The new runtime improves memory management by reclaiming memory as sessions release it rather than holding it at peak usage, delivers consistent cold start times regardless of container size or agent concurrency, and provides billing that tracks actual resource consumption rather than provisioned capacity.

## Evidence

Verbatim from https://aws.amazon.com/blogs/machine-learning/the-new-agentcore-runtime-elastic-optimized-and-consistently-fast-starts/:

> It brings better memory management, reclaiming memory as a session releases it instead of holding it at the peak. It also delivers consistent cold start times regardless of container size or agent concurrency. You get the serverless model you already liked, now more elastic.

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Record: https://forck.live/items/12210-the-new-agentcore-runtime-elastic-optimized-and-consistently-fast-starts
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