AWS Makes AgentCore Runtime V2 Generally Available, Holding P75 Cold Starts Near 2 Seconds
Updated
Updated · AWS Blog · Nov 9
AWS Makes AgentCore Runtime V2 Generally Available, Holding P75 Cold Starts Near 2 Seconds
1 articles · Updated · AWS Blog · Nov 9
Summary
AgentCore Runtime V2 is now generally available, letting existing Bedrock AgentCore users opt in by setting platformVersion to V2 on new or updated runtimes.
P75 cold starts stayed around 2 seconds for container images from 200 MB to 2 GB in AWS tests, versus roughly 5.4 seconds to nearly 30 seconds on the original runtime.
V2 also changes memory behavior: sessions start small, page in more on demand, and release memory when idle, which AWS says should cut GB-hour usage and often lower bills despite a higher per-unit rate.
Create and update operations take several minutes while snapshots are prepared, and containers must report healthy on /ping within 120 seconds only after initialization completes.
The runtime is available in 10 Regions, part of a broader AWS push toward low-disruption upgrades that also includes S3 Tables migration for Hive-to-Iceberg moves and new DynamoDB bulk imports from S3.