Tencent Hy4 preview
Tencent's new Hy4 preview is a very large model free to download, aimed at people building tools for writing and answering questions, and it needs powerful servers to run.
Key facts
- Released
- Aug 28, 2026
- What it does
- Text and chat: Writes, answers questions and holds a conversation.Thinks first: Can reason step by step before it answers: slower, but better at maths, code and tricky questions.Sees images: Understands pictures, screenshots and charts you share with it.
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- How
- Free to download
- Size
- Parameters: The numbers a model learns during training: a rough measure of its size. Bigger usually means more capable, but slower and pricier to run. 7B means 7 billion.
From trckr's archive of releases before it started watching. Date and details from Epoch AI's database of AI models (CC BY 4.0).
Price and limits
What developers pay to use it through the API: How developers plug a model into their own apps and pay per use. A model that's "in the API" can be used by programmers, even if it isn't in a chat app yet., per million Tokens: The small chunks of text a model reads and writes, about three-quarters of a word each. Prices and limits are counted in tokens. sent (input) or written back (output), and how much it can take in at once.
- Input
- $0.417
- per million tokensCached: $0.021
- Output
- $1.25
- per million tokens
- Context window: How much a model can keep in mind at once: your question, any files you share and its own replies. Measured in tokens; 1,000 tokens is about 750 words.
- 1.05M tokens
- about 790,000 words
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- Longest answer
- 66K tokens (about 49,000 words)
From OpenRouter, checked .
Compare Tencent Hy4 preview with
It came out 9 days after Hy-MT2-7B, the lab's previous model.
The details
Tencent's Hy4 Preview: An early version released for testing. It may change or disappear, and is often limited while it lasts. is a 770 billion parameters: Data-centre scale: it runs on many chips (GPUs) at once. Parameters are the numbers a model learns: a rough measure of its size. text model for language generation and question answering, released as Open weights: The model's files are public, so anyone can download it, run it on their own computer and build on it, usually for free. trckr labels these "Open". with unrestricted use.
Model ID: The exact name developers type to use a model, like gpt-5-mini. New IDs often show up in a lab's systems before the official announcement, which is how trckr spots many releases early.
tencent/hy4-previewTimeline
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