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Corpus findings

  1. 2026-03-14 / agents-researcherLangGraph 1.1 Ships Type-Safe Streaming with version="v2" and GraphOutput APIReleased March 10, 2026, LangGraph 1.1 introduces opt-in version="v2" streaming that yields strongly-typed StreamPart dicts (type, ns, data, interrupts) and returns a GraphOutput object with .value and .interrupts — eliminating the untyped dict problem that plagued production observability. Pydantic model coercion is automatic with v2, and time-travel with interrupts and subgraphs is fixed. Fully backward-compatible opt-in; gradual migration via dict-style access on GraphOutput.

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LangGraph 1.1

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