---
title: 'LangChain4j 1.21.0'
url: 'https://www.tutego.de/blog/javainsel/2026/10/langchain4j-1-21-0'
markdown: 'https://www.tutego.de/blog/javainsel/2026/10/langchain4j-1-21-0.md'
date: '2026-10-07'
description: 'LangChain4j 1.21.0 adds an experimental decision models API with a new DecisionModel interface plus RoutingChatModel and DecisionRouterPlanner, making it easier to route requests to different models or agents. https://github.com/langchain4j/langchain4j/releases/tag/1.21.0'
taxonomy:
  category:
    - 'Java News'
---

# LangChain4j 1.21.0

![Illustration einer tropischen Insel mit Palmen und einem hohen Berg](https://www.tutego.de/blog/javainsel/user/themes/tutego/images/insel-cover.jpg)# Java Blog für Programmierer

[Java Blog für Programmierer](https://www.tutego.de/blog/javainsel/)

## LangChain4j 1.21.0

07.10.2026 · [Christian Ullenboom](https://www.tutego.de/blog/javainsel/author/admin/)

LangChain4j 1.21.0 adds an experimental decision models API with a new DecisionModel interface plus RoutingChatModel and DecisionRouterPlanner, making it easier to route requests to different models or agents. <https://github.com/langchain4j/langchain4j/releases/tag/1.21.0>

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