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LangGraph 1.2.0 release notes

Author
LangChain
Published
12 May 2026
Added
8 October 2026
Original
https://github.com/langchain-ai/langgraph/releases/tag/1.2.0

Summary

LangGraph 1.2.0 is the latest minor release of LangChain's graph-based agent framework. It focuses on durability and checkpointing rather than new APIs. PyPI dates it 2026-05-12. Patch releases have followed steadily since; the latest is 1.2.14 on 2026-10-06 (PyPI release history, checked 2026-10-08).

Key points

  • Error handlers can resume durably after the host process crashes.
  • New StateGraph.set_node_defaults() sets shared configuration for all nodes.
  • Delta channels force a full snapshot after a maximum number of supersteps, and the SQLite checkpointer can stream through delta channel history.
  • Requires langchain-core 1.4.0.
  • Later 1.2.x patches: 1.2.12 (2026-09-21) added response_schema to interrupt(); 1.2.13 and 1.2.14 (2026-10-05 and 2026-10-06) fixed checkpoint and update_state bugs with delta channels.
  • Dates on GitHub's release pages have been read back as 2024 by the fetch tool used for this library; PyPI gives 2026 for the same versions, which fits the version sequence. PyPI dates are used here.

Why it matters

LangGraph's 1.x line is mature and changes slowly: five months of patches without a new minor version. The work goes into reliability of long-running, resumable agents.