Amazon Web Services has announced a reworked version of AgentCore, the managed compute layer for its Bedrock agent service. The update, announced on September 18, 2026, is designed to address two operational pain points: memory reuse and cold start latency.
According to the company, the new runtime reclaims memory as agent sessions release it, which should help with elastic memory usage. AWS also says the runtime delivers consistent cold start times, though the announcement does not specify the exact conditions under which this consistency holds.
The changes are aimed at developers running agentic workloads on Bedrock, where session churn and variable latency can affect cost and user experience. No further technical details or benchmarks were included in the announcement.