LangGraph 1.2.15 released
A patch release fixing message handling, checkpoints, and state management in graph execution and resumption.
What changed in 1.2.15
- Messages written to DeltaChannel now receive unique identifiers and are properly stored during state updates.
- Cached nodes, interrupted breakpoints, and forked execution branches now handle state snapshots correctly.
- DeltaChannel writes are replayed in correct order during resumed runs and exit-mode execution.
- ToolNode no longer drops invalid resume values, and control/interrupt events are preserved in event streaming.
Summarised by AgentGid from LangChain's official release notes on GitHub, as reported there; read the original before relying on it. Price, status and release dates come from our daily data.
LangGraph at a glance
| What it is | A low-level orchestration framework for building stateful agents as graphs, with durable execution, persistence and human-in-the-loop steps. Available for Python and JavaScript. |
|---|---|
| Latest version | 1.2.22, Nov 14, 2026. This page is about an earlier release. |
| Release pace | 7 stable releases in the last 30 days; 1.2.15 came 6 days after the previous one |
| Price | Free (OSS). LangGraph is open source and free to use; you pay only for the models and infrastructure it runs on. (checked Nov 5, 2026) |
| Downloads, last 7 days | 19M up 1.7% |
| Gid Score | 74 #2 in Agent frameworks and SDKs |
