---
title: "Hy3 preview Released and Open-Sourced Following Hunyuan Reconstruction: Emphasizing Comprehensive Practicality with Significantly Enhanced Agent Capabilities"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/283793582.md"
description: "Tencent has released and open-sourced the Hunyuan Hy3 preview language model, the first model trained after the Hunyuan reconstruction. It features a total of 295 billion parameters and 21 billion activated parameters, supporting a maximum context length of 256K. By integrating fast and slow thinking, the model significantly improves complex reasoning, instruction following, in-context learning, code processing, and agent capabilities"
datetime: "2026-04-23T08:43:15.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/283793582.md)
  - [en](https://longbridge.com/en/news/283793582.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/283793582.md)
---

# Hy3 preview Released and Open-Sourced Following Hunyuan Reconstruction: Emphasizing Comprehensive Practicality with Significantly Enhanced Agent Capabilities

The Hunyuan Hy3 preview language model by Tencent has been released and open-sourced. This is a mixture-of-experts model that integrates fast and slow thinking, featuring a total of 295 billion parameters and 21 billion activated parameters, with support for a maximum context length of 256K. As the first model trained following the Hunyuan reconstruction, it is also the most intelligent model to date for Hunyuan, achieving substantial improvements in complex reasoning, instruction following, in-context learning, code handling, agent capabilities, and inference performance.

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