# langgraph==1.2.18

Category: agent-infrastructure
Published: 2026-10-26T20:04:45Z
Source: [LangGraph releases](https://github.com/langchain-ai/langgraph/releases/tag/1.2.18)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-26T20:17:49.534Z
Tags: langgraph, workflow, durable-execution

## Human Summary
LangGraph 1.2.18 adjusts DeltaChannel full snapshot intervals to 100 updates, improves error recovery streaming, and fixes tag duplication and checkpoint streaming issues.

## Agent Summary
LangGraph v1.2.18 changes default DeltaChannel full snapshot frequency from 1000 to 100 updates, streams failed task results with comprehensive error recovery, streams final checkpoints on interrupts or recursion limits, and deduplicates subgraph tags.

## Body
LangGraph 1.2.18 introduces a default configuration change for DeltaChannel, triggering full snapshots every 100 updates rather than 1000. This change improves read performance on long threads at the cost of increased storage; the previous behavior can be preserved by setting snapshot frequency=1000. Additionally, the release enhances streaming support by allowing error handlers to recover across all paths while streaming failed task results, and ensuring the final checkpoint streams when a run is halted by an interrupt or recursion limit. Subgraph tag duplication has also been resolved, alongside dependency updates for opentelemetry-api and nbconvert.

## Recommended actions
- Evaluate storage impact of DeltaChannel snapshots taking place every 100 updates instead of 1000.
- Pass snapshot frequency=1000 in DeltaChannel configuration if legacy storage behavior is required.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.