Open sourceOpen-source releaseLarge Language Models1 source · Oct 12, 2026

langchain-ai/langgraph 1.2.15: langgraph==1.2.15

fix(langgraph): give every message written to a messages DeltaChannel an id (#9275)

Key points

  • fix(langgraph): save a cached node's writes like a node that ran (#9259)
  • fix(langgraph): store an updatestate input's writes on the checkpoint it updates (#9258)
  • fix(langgraph): snapshot a DeltaChannel that an updatestate Overwrite resets (#9263)
  • fix(langgraph): replay a resumed exit-mode run's delta writes in live order (#9114)

Sources (1)

  • [1]langchain-ai/langgraph 1.2.15: langgraph==1.2.15
    GitHub: langchain-ai/langgraph · Oct 12, 10:38 PM
    * fix(langgraph): give every message written to a messages DeltaChannel an id (#9275)
    * fix(langgraph): save a cached node's writes like a node that ran (#9259)

Extractive summary: sentences quoted from the sources.

Before this

  1. Oct 12, 2026langchain-ai/langgraph checkpoint==4.3.0: langgraph-checkpoint==4.3.0
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  4. Oct 12, 2026langchain-ai/langchain langchain-anthropic==1.7.6
  5. Oct 12, 2026DTA-GT: Direction- and Topology-Aware Graph Transformer for Neural Network Representation Learning
  6. Oct 12, 2026Alibaba Qwen Introduces QwenGyre: Elastic Reinforcement Learning RL for XLong-Horizon Agents

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