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Hy4 preview

Hy4 preview

Tencent’s 770B open model for long-horizon work

200upvotes
Launched August 29, 2026

About Hy4 preview

Hy4 Preview is an advanced AI model developed by Tencent, featuring a massive 770B mixture of experts (MoE) architecture with 49B active parameters and a 1 million token context window. Designed for long-horizon, agentic tasks, it excels in autonomous operations such as coding, game development, and complex document analysis. The model’s ability to run self-tests and fix bugs before delivery sets it apart, making it highly suitable for developers and organizations seeking reliable, long-term AI assistance. Its open-source nature and focus on agentic capabilities make it a powerful tool for pushing the boundaries of AI-driven automation and problem-solving. Hy4 Preview aims to provide a scalable, self-sufficient AI experience, reducing the need for constant human oversight in demanding technical tasks and enabling more efficient workflows.

Screenshots

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+5 more screenshots

Pros

  • Massive 770B MoE architecture for high performance
  • Very long context window (1M tokens) for complex tasks
  • Autonomous testing and bug fixing capabilities
  • Designed for long-horizon, agentic work
  • Open source approach fosters transparency and customization

Cons

  • Limited information on user interface and integration options
  • Potentially high computational resource requirements
  • No user ratings or reviews available yet

Use Cases

1Automated coding and software development
2Complex game development workflows
3In-depth document analysis and summarization
4Autonomous testing and debugging of AI models
5Long-term project management and planning
6Research and development in AI-driven automation

Pricing

Pricing not verified

Quick Info

Upvotes200
Comments3
Launched8/29/2026

Topics

Open SourceArtificial Intelligence

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