LangChain AI Updates: April 2, 2026

1. LangChain March 2026 Newsletter Previews April Workshop and Conference Plans

LangChain. LangChain published its March 2026 newsletter on April 1, 2026, recapping recent milestones including LangGraph v1.1 with type-safe streaming, the rebranding of Agent Builder to LangSmith Fleet with agent identity and permissions, and the launch of Polly, the general availability of their observability assistant. The newsletter also announced an AI Agents Workshop with LangChain CEO Harrison Chase scheduled for April 16 in New York, along with LangChain’s planned presence at Google Cloud Next from April 22-24 in Las Vegas. LangGraph v1.1.4 is the latest GitHub release, described as fully backwards compatible with the v1.0 API. Source