Long-horizon agentic work
Hy4 Preview is positioned for long-horizon agentic tasks.
Productivity / product dossier
Hy4 preview
An open 770B MoE model for long-horizon coding and document analysis.
Product brief
What Hy4 preview does.
Hy4 Preview is a 770B MoE model (49B active, 1M context) from Tencent, built for long-horizon agentic tasks. It autonomously handles coding, game dev, and complex document analysis, running its own tests and fixing bugs before delivery.
Why we selected it
A technically notable open 770B MoE model with 1M context, positioned for autonomous coding, testing, bug fixing, game development, and document analysis.
- Best for
- Builders evaluating agentic foundation models
- Category
- Productivity
- Daily picks
- 1
- First selected
- 2026-08-31
Product preview saved with our daily selection
Capability scan
What it can help with.
Only capabilities supported by the product information we collected are listed here.
Coding and testing workflow
It is described as autonomously handling coding, running its own tests, and fixing bugs before delivery.
Game development
The model is positioned for game development work.
Complex document analysis
The model is positioned for analyzing complex documents.
Best-fit use cases
Evaluate a foundation model for long-horizon agentic tasks.
Use the model for coding work that includes running tests and fixing bugs before delivery.
Apply the model to game-development tasks.
Analyze complex documents with a model described as having a 1M context window.
FAQ
Before you open it.
What is Hy4 Preview?
Hy4 Preview is a Tencent model positioned for long-horizon agentic tasks.
What model size is stated for Hy4 Preview?
The description identifies it as a 770B mixture-of-experts model with 49B active parameters.
What context length is stated?
The stated context length is 1M.
What tasks is it described as handling?
The description lists coding, game development, complex document analysis, running tests, and fixing bugs before delivery.
Is Hy4 Preview described as open?
Yes. The supplied editorial selection reason characterizes it as an open 770B MoE model.