Summary
LangChain released the first major 1.0 versions of its open-source LangChain and LangGraph frameworks. LangChain 1.0 refocuses on the core agent loop with a new middleware model and updated integrations, while LangGraph 1.0 targets production, long-running agents with durable state, built-in persistence, and first-class human-in-the-loop APIs — backed by a no-breaking-changes commitment until 2.0.
What changed
On July 2, 2026 LangChain shipped LangChain 1.0 (core agent loop, middleware for customization, provider-agnostic tool calling) and LangGraph 1.0 (durable auto-persisted execution state, resumable workflows, human-in-the-loop pause/approve APIs), marking a stability milestone with no breaking changes promised until 2.0.
Why it matters
As the most widely adopted open-source agent frameworks, LangChain and LangGraph reaching 1.0 with an explicit stability pledge signals the ecosystem is maturing from experimentation to production-grade infrastructure. Durable state and resumable, human-gated workflows address the reliability gaps that have blocked long-running agents in enterprise settings.
Evidence excerpt
These 1.0 releases mark a commitment to stability for the open source libraries with no breaking changes until 2.0.