LangChain AI Updates: May 13, 2026

1. Delta Channels deep-dive quantifies a 41x checkpoint storage cut

LangChain. A new engineering write-up from Sydney Runkle details how the DeltaChannel primitive in LangGraph 1.2 reshapes checkpoint storage for long-running agents, citing a 200-turn coding agent that dropped from 5.3GB to 129MB. The post explains the periodic full-snapshot anchor every K steps (default 50 in Deep Agents), the O(N²) to O(N) growth change, and confirms the feature ships by default in Deep Agents v0.6 with no API surface changes for interrupts or time-travel. Source