# Tencent Hy3-preview (295B-A21B)

> Tencent Hunyuan's 295B sparse MoE preview combines a dense first FFN layer, GQA with QK-Norm, and one extra MTP layer for faster generation.

| Property | Value |
| --- | --- |
| Lab | Tencent (China) |
| Released | 2026-04-23 |
| Decoder type | Sparse MoE |
| Family | Sparse MoE |
| Scale | 295B total, 21B active (7.1% active) |
| Context window | 262,144 tokens |
| Attention | GQA with QK-Norm |
| Layer mix | 80 GQA + 1 MTP layer |
| KV cache / token (bf16) | 320 KiB (Very high) |
| License | Tencent Hy Community License Agreement |

**Key detail:** Uses 192 routed experts, 8 routed plus 1 shared expert active per token, sigmoid routing with expert bias, and a 3.8B MTP layer.

## Architecture concepts

- [QK-Norm (QK-Norm)](https://llm-atlas-7or.pages.dev/concepts/qk-norm.md): RMSNorm applied to queries and keys before attention to keep logits well-behaved.
- [Grouped-Query Attention (GQA)](https://llm-atlas-7or.pages.dev/concepts/gqa.md): Several query heads share one key/value head, shrinking the KV cache with little quality loss.
- [Mixture of Experts (MoE)](https://llm-atlas-7or.pages.dev/concepts/moe.md): Many feed-forward experts, but a router sends each token to only a few of them.
- [Multi-Token Prediction (MTP)](https://llm-atlas-7or.pages.dev/concepts/mtp.md): Extra heads learn to predict several future tokens, and can draft tokens at inference.

## Benchmark (Artificial Analysis Intelligence Index)

- AA Intelligence Index v4.3.2: total 17 (Scientific 3.6)

## Links

- Architecture diagram: https://sebastianraschka.com/llm-architecture-gallery/images/architectures/tencent-hy3.webp
- config.json: https://huggingface.co/tencent/Hy3-preview/blob/main/config.json
- License: https://huggingface.co/tencent/Hy3-preview/blob/main/LICENSE
- Tech report: https://www.tencent.com/en-us/articles/2202320.html
- Source card (source of truth): https://sebastianraschka.com/llm-architecture-gallery/#card-tencent-hy3-preview-295b-a21b
- Web page: https://llm-atlas-7or.pages.dev/models/tencent-hy3-preview-295b-a21b/
- JSON: https://llm-atlas-7or.pages.dev/api/models/tencent-hy3-preview-295b-a21b.json

_Data from Sebastian Raschka's LLM Architecture Gallery (https://sebastianraschka.com/llm-architecture-gallery/). Synced 2026-11-04._