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

What moved

Today we are announcing the new AgentCore runtime, a capability of Amazon Bedrock AgentCore built for the speed, flexibility, and cost efficiency that production agents demand. It reclaims memory as sessions release it and delivers consistent cold starts regardless of image size or concurrency. AWS issued this as an official post on 2026-09-18. The desk files the title and summary from the allow-listed official source, not a rewrite of claims the source did not make.

Why it matters

Today we are announcing the new AgentCore runtime, a capability of Amazon Bedrock AgentCore built for the speed, flexibility, and cost efficiency that production agents demand. That is a public launch file from AWS, dated 2026-09-18. Tagged Agents / Enterprise.

On the record

• Filed from the AWS official RSS on 2026-09-18.
• Primary source host: aws.amazon.com.
• Today we are announcing the new AgentCore runtime, a capability of Amazon Bedrock AgentCore built for the speed, flexibility, and cost efficiency that production agents demand.