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LangGraph v1.2 Ships Content-Block-Aware Streaming: Typed Per-Channel Projections, v3 Event Protocol, and Python 3.10–3.14 Support
LangGraph 1.2.0 released May 11 introduces a content-block-centric streaming protocol (version='v3') with typed, per-channel projections for run.values, run.messages, run.lifecycle, and run.subgraphs. The run.messages channel yields one ChatModelStream per LLM call with sub-projections for text, reasoning, tool calls, and usage. Also includes improved interrupt() semantics and full Python 3.10–3.14 support. This is the first major streaming overhaul since LangGraph 1.0 GA.
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