How to Build a Model Router in the Harness
LangChain presented a new method for building a model router, which reduced the median cost per coding task by 64% with no measurable drop in quality.
Source: LangChain
October 2, 2026
October 1, 2026
What Is Jev? A Guide to TypeSafe AI’s System One Model
LangChain provided a guide to TypeSafe AI's System One model, known as Jev, explaining its function, fit in agent loops, and use with LangChain.
September 29, 2026
Jev is now available in LangSmith Evals
Jev is now available as a judge for LangSmith Evals, providing faster and cheaper structured feedback on agent traces.
September 28, 2026
New in LangSmith: Engine v2, Managed Deep Agents, Fine-Tuning, and more
LangChain announced new updates to LangSmith, including Engine v2 with red teaming and automatic testing, a new version of Managed Deep Agents, trajectories, and more.
LangSmith Custom Apps: Build custom interfaces around your agent data
LangSmith Custom Apps allows users to build custom interfaces around their LangSmith data, publish them to their workspace, and bypass hosting, authentication, and permissions work.
Building Production Agents with Jev and LangGraph
LangGraph demonstrates orchestrating Jev, TypeSafe AI's decision model, to build faster, cheaper production agents.